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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549





FORM 10-Q







|x | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ---------------------------------------------------------------------------------------

For the quarterly period ended September 30, 2008

OR



| ̈ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ----------------------------------------------------------------------------------------

For the transition period from  to

Commission file number: 001-33023





Riverbed Technology, Inc.

(Exact name of registrant as specified in its charter)







|                                                               |  |                                        
|-------------------------------------------------------------- |  | ---------------------------------------
|Delaware                                                       |  | 03-0448754                             
|(State or Other Jurisdiction of Incorporation or Organization) |  | (I.R.S. Employer Identification Number)

199 Fremont Street

San Francisco, California 94105

(Address of Principal Executive Offices
including Zip Code)

(415) 247-8800

(Registrants Telephone Number, Including Area Code)





Indicate by check mark whether the registrant
(1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and
(2) has been subject to such filing requirements for the past 90 days.    Yes  x    No   ̈

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See
definitions of large accelerated filer, accelerated filer and smaller reporting company in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer  x            Accelerated filer   ̈            Non-accelerated filer   ̈            Smaller reporting company   ̈

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes   ̈    No  x

The number of shares of the registrants
common stock, par value $0.0001, outstanding as of October 23, 2008 was: 71,322,183.









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Riverbed Technology, Inc.

INDEX

PART I. FINANCIAL INFORMATION



|         |  |                                                                                                                               |  |         
|-------- |  | ----------------------------------------------------------------------------------------------------------------------------- |  | --------
|         |  |                                                                                                                               |  | Page No.
|Item 1.  |  | Financial Statements                                                                                                          |  |         
|         |  | Condensed Consolidated Balance Sheets as of September 30, 2008 and December 31, 2007                                          |  | 3       
|         |  | Condensed Consolidated Statements of Operations for the three and nine months ended September 30, 2008 and September 30, 2007 |  | 4       
|         |  | Condensed Consolidated Statements of Cash Flows for the nine months ended September 30, 2008 and September 30, 2007           |  | 5       
|         |  | Notes to Condensed Consolidated Financial Statements                                                                          |  | 6       
|         |  |                                                                                                                              
|Item 2.  |  | Managements Discussion and Analysis of Financial Condition and Results of Operations                                         |  | 16      
|         |  |                                                                                                                              
|Item 3.  |  | Quantitative and Qualitative Disclosures About Market Risk                                                                    |  | 26      
|         |  |                                                                                                                              
|Item 4.  |  | Controls and Procedures                                                                                                       |  | 26      
|         |  |                                                                                                                              
|         |  | PART II. OTHER INFORMATION                                                                                                    |  |         
|         |  |                                                                                                                              
|Item 1.  |  | Legal Proceedings                                                                                                             |  | 27      
|         |  |                                                                                                                              
|Item 1A. |  | Risk Factors                                                                                                                  |  | 28      
|         |  |                                                                                                                              
|Item 2.  |  | Unregistered Sales of Equity Securities and Use of Proceeds                                                                   |  | 39      
|         |  |                                                                                                                              
|Item 6.  |  | Exhibits                                                                                                                      |  | 40      



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|Item 1. | Financial Statements
|------- | --------------------

RIVERBED TECHNOLOGY, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

As of September 30, 2008 and December 31, 2007

(in thousands)



|                                                                                                                                                                                                         |  |                   |         |   |                  |   |         |  
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ----------------- | ------- | - | ---------------- | - | ------- | -
|                                                                                                                                                                                                         |  | September 30,2008 |         |   | December 31,2007 |  
|                                                                                                                                                                                                         |  | (unaudited)       |         |   |                  |  
|ASSETS                                                                                                                                                                                                   |  |                   |         |   |                  |   |         |  
|Current assets:                                                                                                                                                                                          |  |                   |         |   |                  |   |         |  
|Cash and cash equivalents                                                                                                                                                                                |  | $                 | 117,324 |   |                  | $ | 162,979 |  
|Marketable securities                                                                                                                                                                                    |  |                   | 164,180 |   |                  |   | 83,103  |  
|Trade receivables, net of allowances of $600 and $734 as of September 30, 2008 and December 31, 2007, respectively                                                                                       |  |                   | 43,245  |   |                  |   | 50,072  |  
|Other receivables                                                                                                                                                                                        |  |                   | 1,022   |   |                  |   | 1,273   |  
|Inventory                                                                                                                                                                                                |  |                   | 13,796  |   |                  |   | 9,413   |  
|Prepaid expenses and other current assets                                                                                                                                                                |  |                   | 10,396  |   |                  |   | 5,136   |  
|                                                                                                                                                                                                         |  |                   |         |   |                  |   |         |  
|Total current assets                                                                                                                                                                                     |  |                   | 349,963 |   |                  |   | 311,976 |  
|                                                                                                                                                                                                         |  |                   |         |   |                  |   |         |  
|Fixed assets, net                                                                                                                                                                                        |  |                   | 21,614  |   |                  |   | 18,826  |  
|Other assets                                                                                                                                                                                             |  |                   | 9,146   |   |                  |   | 6,800   |  
|                                                                                                                                                                                                         |  |                   |         |   |                  |   |         |  
|Total assets                                                                                                                                                                                             |  | $                 | 380,723 |   |                  | $ | 337,602 |  
|                                                                                                                                                                                                         |  |                   |         |   |                  |   |         |  
|LIABILITIES AND STOCKHOLDERS EQUITY                                                                                                                                                                     |  |                   |         |   |                  |   |         |  
|Current liabilities:                                                                                                                                                                                     |  |                   |         |   |                  |   |         |  
|Accounts payable                                                                                                                                                                                         |  | $                 | 18,539  |   |                  | $ | 20,325  |  
|Accrued compensation and benefits                                                                                                                                                                        |  |                   | 13,029  |   |                  |   | 14,290  |  
|Other accrued liabilities                                                                                                                                                                                |  |                   | 27,469  |   |                  |   | 9,381   |  
|Deferred revenue                                                                                                                                                                                         |  |                   | 40,451  |   |                  |   | 26,845  |  
|                                                                                                                                                                                                         |  |                   |         |   |                  |   |         |  
|Total current liabilities                                                                                                                                                                                |  |                   | 99,488  |   |                  |   | 70,841  |  
|                                                                                                                                                                                                         |  |                   |         |   |                  |   |         |  
|Deferred revenue, non-current                                                                                                                                                                            |  |                   | 9,836   |   |                  |   | 6,634   |  
|Other long-term liabilities                                                                                                                                                                              |  |                   | 302     |   |                  |   | 409     |  
|                                                                                                                                                                                                         |  |                   |         |   |                  |   |         |  
|Total long-term liabilities                                                                                                                                                                              |  |                   | 10,138  |   |                  |   | 7,043   |  
|                                                                                                                                                                                                         |  |                   |         |   |                  |   |         |  
|Commitments and contingencies                                                                                                                                                                            |  |                   |         |   |                  |   |         |  
|Stockholders equity:                                                                                                                                                                                    |  |                   |         |   |                  |   |         |  
|Preferred stock, $0.0001 par value  30,000 shares authorized, no shares outstanding                                                                                                                     |  |                   |        |   |                  |   |        |  
|Common stock and additional paid-in-capital; $0.0001 par value  600,000 shares authorized; 71,302 and 71,332 shares issued and
outstanding as of September 30, 2008 and December 31, 2007, respectively |  |                   | 318,067 |   |                  |   | 295,487 |  
|Deferred stock-based compensation                                                                                                                                                                        |  |                   | (1,469  | ) |                  |   | (3,287  | )
|Accumulated deficit                                                                                                                                                                                      |  |                   | (45,189 | ) |                  |   | (32,535 | )
|Accumulated other comprehensive income (loss)                                                                                                                                                            |  |                   | (312    | ) |                  |   | 53      |  
|                                                                                                                                                                                                         |  |                   |         |   |                  |   |         |  
|Total stockholders equity                                                                                                                                                                               |  |                   | 271,097 |   |                  |   | 259,718 |  
|                                                                                                                                                                                                         |  |                   |         |   |                  |   |         |  
|Total liabilities and stockholders equity                                                                                                                                                               |  | $                 | 380,723 |   |                  | $ | 337,602 |  
|                                                                                                                                                                                                         |  |                   |         |   |                  |   |         |  

See Notes to Condensed Consolidated Financial Statements.



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RIVERBED TECHNOLOGY, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share amounts)

(unaudited)



|                                                             |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|------------------------------------------------------------ |  | ------------------------------- | ------- | ------------------------------ | ---- | - | ------ |  | - | ------- | - |  | - | -------
|                                                             |  | Three months endedSeptember 30, |         | Nine months endedSeptember 30,
|                                                             |  | 2008                            |         |                                | 2007 |   | 2008   |  |   | 2007   
|Revenue:                                                     |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Product                                                      |  | $                               | 65,238  |                                |      | $ | 52,508 |  | $ | 185,574 |   |  | $ | 133,335
|Support and services                                         |  |                                 | 21,309  |                                |      |   | 10,802 |  |   | 55,547  |   |  |   | 26,761 
|                                                             |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Total revenue                                                |  |                                 | 86,547  |                                |      |   | 63,310 |  |   | 241,121 |   |  |   | 160,096
|                                                             |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Cost of revenue:                                             |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Cost of product                                              |  |                                 | 16,653  |                                |      |   | 14,029 |  |   | 45,153  |   |  |   | 37,053 
|Cost of support and services                                 |  |                                 | 7,174   |                                |      |   | 4,111  |  |   | 20,151  |   |  |   | 9,999  
|                                                             |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Total cost of revenue                                        |  |                                 | 23,827  |                                |      |   | 18,140 |  |   | 65,304  |   |  |   | 47,052 
|                                                             |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Gross profit                                                 |  |                                 | 62,720  |                                |      |   | 45,170 |  |   | 175,817 |   |  |   | 113,044
|                                                             |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Operating expenses:                                          |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Sales and marketing                                          |  |                                 | 34,855  |                                |      |   | 25,139 |  |   | 100,992 |   |  |   | 63,035 
|Research and development                                     |  |                                 | 14,582  |                                |      |   | 10,890 |  |   | 43,278  |   |  |   | 27,384 
|General and administrative                                   |  |                                 | 10,419  |                                |      |   | 7,177  |  |   | 29,925  |   |  |   | 16,814 
|Other charges                                                |  |                                 | 11,000  |                                |      |   |       |  |   | 11,000  |   |  |   |       
|                                                             |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Total operating expenses                                     |  |                                 | 70,856  |                                |      |   | 43,206 |  |   | 185,195 |   |  |   | 107,233
|                                                             |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Operating income (loss)                                      |  |                                 | (8,136  | )                              |      |   | 1,964  |  |   | (9,378  | ) |  |   | 5,811  
|                                                             |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Other income, net                                            |  |                                 | 1,287   |                                |      |   | 2,754  |  |   | 5,059   |   |  |   | 7,028  
|                                                             |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Income (loss) before provision for income taxes              |  |                                 | (6,849  | )                              |      |   | 4,718  |  |   | (4,319  | ) |  |   | 12,839 
|Provision for income taxes                                   |  |                                 | 5,574   |                                |      |   | 1,950  |  |   | 8,335   |   |  |   | 2,868  
|                                                             |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Net income (loss)                                            |  | $                               | (12,423 | )                              |      | $ | 2,768  |  | $ | (12,654 | ) |  | $ | 9,971  
|                                                             |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Net income (loss) per common share:                          |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Basic                                                        |  | $                               | (0.17   | )                              |      | $ | 0.04   |  | $ | (0.18   | ) |  | $ | 0.15   
|                                                             |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Diluted                                                      |  | $                               | (0.17   | )                              |      | $ | 0.04   |  | $ | (0.18   | ) |  | $ | 0.14   
|                                                             |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Shares used in computing net income (loss) per common share: |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Basic                                                        |  |                                 | 71,005  |                                |      |   | 69,069 |  |   | 70,915  |   |  |   | 67,397 
|Diluted                                                      |  |                                 | 71,005  |                                |      |   | 74,360 |  |   | 70,915  |   |  |   | 72,934 
|Stock-based compensation expense included in above:          |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Cost of product                                              |  | $                               | 54      |                                |      | $ | 27     |  | $ | 131     |   |  | $ | 68     
|Cost of support and services                                 |  |                                 | 1,125   |                                |      |   | 806    |  |   | 3,470   |   |  |   | 1,798  
|Sales and marketing                                          |  |                                 | 5,921   |                                |      |   | 4,455  |  |   | 17,869  |   |  |   | 10,741 
|Research and development                                     |  |                                 | 3,419   |                                |      |   | 2,511  |  |   | 9,879   |   |  |   | 5,958  
|General and administrative                                   |  |                                 | 2,512   |                                |      |   | 1,564  |  |   | 6,808   |   |  |   | 3,614  
|                                                             |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        
|Total stock-based compensation expense                       |  | $                               | 13,031  |                                |      | $ | 9,363  |  | $ | 38,157  |   |  | $ | 22,179 
|                                                             |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |        

See Notes to Condensed Consolidated Financial Statements.



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RIVERBED TECHNOLOGY, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

(unaudited)



|                                                                                         |  |                                |          |   |      |   |         |  
|---------------------------------------------------------------------------------------- |  | ------------------------------ | -------- | - | ---- | - | ------- | -
|                                                                                         |  | Nine months endedSeptember 30, |         
|                                                                                         |  | 2008                           |          |   | 2007 |  
|Operating Activities:                                                                    |  |                                |          |   |      |   |         |  
|Net income (loss)                                                                        |  | $                              | (12,654  | ) |      | $ | 9,971   |  
|Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |                                |          |   |      |   |         |  
|Depreciation and amortization                                                            |  |                                | 7,338    |   |      |   | 3,418   |  
|Stock-based compensation                                                                 |  |                                | 38,157   |   |      |   | 22,179  |  
|Provision for inventory                                                                  |  |                                | 4,797    |   |      |   | 935     |  
|Excess tax benefit from employee stock plans                                             |  |                                | (1,427   | ) |      |   |        |  
|Changes in operating assets and liabilities:                                             |  |                                |          |   |      |   |         |  
|Trade receivables                                                                        |  |                                | 5,521    |   |      |   | (19,645 | )
|Inventory                                                                                |  |                                | (12,517  | ) |      |   | (5,394  | )
|Prepaid expenses and other assets                                                        |  |                                | (5,065   | ) |      |   | (174    | )
|Accounts payable and other current liabilities                                           |  |                                | 16,102   |   |      |   | 12,139  |  
|Income taxes payable                                                                     |  |                                | 4,762    |   |      |   | 2,645   |  
|Deferred revenue                                                                         |  |                                | 17,385   |   |      |   | 9,051   |  
|                                                                                         |  |                                |          |   |      |   |         |  
|Net cash provided by operating activities                                                |  |                                | 62,399   |   |      |   | 35,125  |  
|                                                                                         |  |                                |          |   |      |   |         |  
|Investing Activities:                                                                    |  |                                |          |   |      |   |         |  
|Capital expenditures                                                                     |  |                                | (10,761  | ) |      |   | (5,707  | )
|Purchase of available for sale securities                                                |  |                                | (121,077 | ) |      |   | (69,132 | )
|Proceeds from sales and maturities of available for sale securities                      |  |                                | 39,803   |   |      |   | 10,980  |  
|Increase in other assets                                                                 |  |                                | (1,404   | ) |      |   | (2,100  | )
|                                                                                         |  |                                |          |   |      |   |         |  
|Net cash used in investing activities                                                    |  |                                | (93,439  | ) |      |   | (65,959 | )
|                                                                                         |  |                                |          |   |      |   |         |  
|Financing Activities:                                                                    |  |                                |          |   |      |   |         |  
|Proceeds from public offerings, net of expenses                                          |  |                                |         |   |      |   | 87,681  |  
|Proceeds from issuance of common stock under employee stock plans, net of repurchases    |  |                                | 9,119    |   |      |   | 7,094   |  
|Payments for repurchases of common stock                                                 |  |                                | (24,992  | ) |      |   |        |  
|Excess tax benefit from employee stock plans                                             |  |                                | 1,427    |   |      |   |        |  
|                                                                                         |  |                                |          |   |      |   |         |  
|Net cash provided by (used in) financing activities                                      |  |                                | (14,446  | ) |      |   | 94,775  |  
|                                                                                         |  |                                |          |   |      |   |         |  
|Effect of exchange rate changes on cash and cash equivalents                             |  |                                | (169     | ) |      |   | 74      |  
|                                                                                         |  |                                |          |   |      |   |         |  
|Net increase (decrease) in cash and cash equivalents                                     |  |                                | (45,655  | ) |      |   | 64,015  |  
|Cash and cash equivalents at beginning of period                                         |  |                                | 162,979  |   |      |   | 105,330 |  
|                                                                                         |  |                                |          |   |      |   |         |  
|Cash and cash equivalents at end of period                                               |  | $                              | 117,324  |   |      | $ | 169,345 |  
|                                                                                         |  |                                |          |   |      |   |         |  

See Notes to Condensed Consolidated Financial Statements.



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RIVERBED TECHNOLOGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)



|1. | ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES
|-- | ------------------------------------------------

Organization

Riverbed Technology, Inc. was founded on May 23, 2002 and has developed a comprehensive solution to the fundamental problems of
wide-area distributed computing. Our products enable our customers simply and efficiently to improve the performance of their applications and access to their data over wide area networks (WANs).

Significant Accounting Policies

Basis of Presentation

The condensed consolidated financial statements include our accounts and the accounts of our wholly owned subsidiaries. Intercompany
transactions and balances have been eliminated. The accompanying condensed consolidated balance sheet as of September 30, 2008, the condensed consolidated statements of operations for the three and nine months ended September 30, 2008 and
September 30, 2007, and the condensed consolidated statements of cash flows for the nine months ended September 30, 2008 and September 30, 2007 are unaudited. The accompanying statements should be read in conjunction with the audited
consolidated financial statements and related notes contained in our Annual Report on Form 10-K for the year ended December 31, 2007.

The accompanying condensed consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles, or GAAP, pursuant to the rules and regulations of the Securities and Exchange
Commission, or SEC. They do not include all of the financial information and footnotes required by GAAP for complete financial statements. We believe the unaudited condensed consolidated financial statements have been prepared on the same basis as
the audited financial statements and include all adjustments necessary for the fair presentation of our balance sheet as of September 30, 2008, and our results of operations and cash flows for the three and nine months ended September 30,
2008 and September 30, 2007. All adjustments are of a normal recurring nature. Certain prior period amounts have been reclassified to conform to the current period presentation. The results for the three and nine months ended September 30,
2008 are not necessarily indicative of the results to be expected for any subsequent quarter or for the fiscal year ending December 31, 2008.

Other than the adoption of the provisions of Financial Accounting Standards Board Statement No. 157, Fair Value Measurements, or SFAS No. 157, there have been no significant changes in our accounting policies during the
three and nine months ended September 30, 2008 as compared to the significant accounting policies described in our Annual Report on Form 10-K for the year ended December 31, 2007.

Use of Estimates

GAAP requires us to make
certain estimates and judgments that can affect the reported amounts of assets and liabilities as of the date of the consolidated financial statements, as well as the reported amounts of revenue and expenses during the periods presented. Significant
estimates and assumptions made by management include the determination of the fair value of stock awards issued, the allowance for doubtful accounts, inventory valuation and the accounting for income taxes including the determination of the timing
of the release of our valuation allowance related to our deferred tax asset balances. We believe that the estimates and judgments upon which we rely are reasonable based upon information available to us at the time that these estimates and judgments
were made. To the extent there are material differences between these estimates and actual results, our consolidated financial statements will be affected.

Revenue Recognition

Our software is integrated on appliance hardware and is essential to the functionality of the
product. As a result, we account for revenue in accordance with Statement of Position, or SOP, 97-2, Software Revenue Recognition, as amended by SOP 98-9, Modification of SOP 97-2, Software Revenue Recognition, With Respect to
Certain Transactions, for all transactions involving the sale of software. We recognize product revenue when all of the following have occurred: (1) we have entered into a legally binding arrangement with a customer; (2) delivery has
occurred, which is when product title transfers to the customer; (3) customer payment is deemed fixed or determinable and free of contingencies and significant uncertainties; and (4) collection is probable.



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Product revenue consists of revenue from sales of our appliances and software licenses. Product sales
include a perpetual license to our software. Product revenue is generally recognized upon transfer of title at shipment, assuming all other revenue recognition criteria are met. Shipping charges billed to customers are included in product revenue
and the related shipping costs are included in cost of product revenue. Product revenue on sales to channel partners is recorded once we have received persuasive evidence of an end-user and all other revenue recognition criteria have been met.

Substantially all of our product sales have been sold in combination with support services, which consist of software updates and support.
Software updates provide customers with rights to unspecified software product upgrades and to maintenance releases and patches released during the term of the support period. Support includes access to technical support personnel and content via
the internet and telephone. Support services also include an extended warranty for the repair or replacement of defective hardware. Revenue for support services is recognized on a straight-line basis over the service contract term, which is
typically one year.

We use the residual method to recognize revenue when a product agreement includes one or more elements to be delivered
at a future date and vendor specific objective evidence, or VSOE, of the fair value of all undelivered elements exists. Through September 30, 2008, in virtually all of our contracts, the only element that remained undelivered at the time of
delivery of the product was support and updates. Under the residual method, the fair value of the undelivered elements is deferred and the remaining portion of the contract fee is recognized as product revenue. If evidence of the fair value of one
or more undelivered elements does not exist, all revenue is generally deferred and recognized when delivery of those elements occurs or when fair value can be established. When the undelivered element for which we do not have a fair value is
support, revenue for the entire arrangement is bundled and recognized ratably over the support period. VSOE of fair value for elements of an arrangement is based upon the normal pricing and discounting practices for those services when sold
separately, and VSOE for support services is measured by the renewal rate offered to the customer.

Our fees are typically considered to be
fixed or determinable at the inception of an arrangement, generally based on specific products and quantities to be delivered. Substantially all of our contracts do not include rights of return or acceptance provisions. To the extent that our
agreements contain such terms, we recognize revenue once the acceptance provisions or right of return lapses. Payment terms to customers generally range from net 30 to 60 days. In the event payment terms are provided that differ from our
standard business practices, the fees are deemed to not be fixed or determinable and revenue is recognized when the payments become due, provided the remaining criteria for revenue recognition have been met.

We assess the ability to collect from our customers based on a number of factors, including credit worthiness of the customer and past transaction
history of the customer. If the customer is not deemed credit worthy, we defer all revenue from the arrangement until payment is received and all other revenue recognition criteria have been met.

Stock-Based Compensation

Prior to
January 1, 2006, we accounted for employee stock options using the intrinsic value method in accordance with Accounting Principles Board, or APB, Opinion No. 25, Accounting for Stock Issued to Employees, and Financial Accounting
Standards Board Interpretation, or FIN, 44, Accounting for Certain Transactions Involving Stock Compensation, an Interpretation of APB No. 25, and had adopted the disclosure only provisions of Statement of Financial Accounting
Standards, or SFAS, No. 123, Accounting for Stock-Based Compensation,and SFAS No. 148, Accounting for Stock-Based Compensation  Transition and Disclosure.

In accordance with APB 25, stock-based compensation expense, which is a non-cash charge, resulted from stock option grants at exercise prices that, for
financial reporting purposes, were deemed to be below the estimated fair value of the underlying common stock on the date of grant. Through December 31, 2005, we recorded deferred stock-based compensation relative to these options of
approximately $9.9 million, which is being amortized on a straight-line basis over the service period, which generally corresponds to the vesting period. During the three months ended September 30, 2008 and 2007, we amortized $457,000 and
$566,000, respectively, of deferred compensation expense, net of reversals for terminations, related to these options, and in the nine months ended September 30, 2008 and 2007, we amortized $1.5 million and $1.7 million, respectively.

Effective January 1, 2006, we adopted the fair value recognition provisions of SFAS No. 123(R), Share-Based Payment,
using the prospective transition method, which requires us to apply the provisions of SFAS No. 123(R) to new awards granted, and to awards modified, repurchased or cancelled, after the effective date. New awards granted include stock options,
restricted stock units, or RSUs, and stock purchased under our Employee Stock Purchase Plan, or Purchase Plan. Under this method, stock-based compensation expense recognized beginning January 1, 2006 is based on a combination of the following:
(a) the grant-date fair value of stock option, RSU and employee stock purchase plan awards granted or modified after January 1, 2006; and (b) the amortization of deferred stock-based compensation related to stock option awards granted
prior to January 1, 2006, which was calculated using the intrinsic value method as previously permitted under APB 25.



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Under SFAS No. 123(R), we estimated the fair value of stock options granted using the Black-Scholes
option-pricing formula and a single option award approach. This model utilizes the estimated fair value of common stock and requires that, at the date of grant, we use the expected term of the option, the expected volatility of the price of our
common stock, risk free interest rates and expected dividend yield of our common stock. This fair value is then amortized on a straight-line basis over the requisite service periods of the awards, which is generally four years.

On September 20, 2006, the effective date of the registration statement relating to our initial public offering, or IPO, we implemented the Purchase
Plan, which has a two year offering period and two purchases per year. The fair value of shares granted under the Purchase Plan is amortized over the two year offering period. Under the Purchase Plan, employees may purchase shares of common stock
through payroll deductions at a price per share that is 85% of the lesser of the fair market value of our common stock as of the beginning of an applicable offering period or the applicable purchase date, with purchases generally every six months.

In the second quarter of 2008, we granted 856,700 RSUs. The fair value of RSUs is based on the closing market price of our common stock on
the date of grant and the related compensation expense, net of estimated forfeitures, is amortized on a straight-line basis over the service period of four years. No RSUs were granted in the third quarter of 2008.

The fair value of options granted and Purchase Plan shares was estimated at the date of grant using the following assumptions:



|                                      |  |                                 |      |   |                                |   |       |      |  |   |            |   |  |   |            |  
|------------------------------------- |  | ------------------------------- | ---- | - | ------------------------------ | - | ----- | ---- |  | - | ---------- | - |  | - | ---------- | -
|                                      |  | Three months endedSeptember 30, |      |   | Nine months endedSeptember 30, |  
|                                      |  | 2008                            |      |   | 2007                           |   |       | 2008 |  |   | 2007       |  
|Employee Stock Options                |  |                                 |      |   |                                |   |       |      |  |   |            |   |  |   |            |  
|Expected life in years                |  |                                 | 4.5  |   |                                |   | 4.5   |      |  |   | 2.5 - 4.5  |   |  |   | 4.5        |  
|Risk-free interest rate               |  |                                 | 3.1  | % |                                |   | 4.2   | %    |  |   | 2.4% - 3.1 | % |  |   | 4.2% - 4.9 | %
|Volatility                            |  |                                 | 50   | % |                                |   | 57    | %    |  |   | 48% - 51   | % |  |   | 57% - 62   | %
|Weighted average fair value of grants |  | $                               | 6.82 |   |                                | $ | 22.31 |      |  | $ | 11.56      |   |  | $ | 18.23      |  



|                                      |  |                                          |            |   |      |   |            |  
|------------------------------------- |  | ---------------------------------------- | ---------- | - | ---- | - | ---------- | -
|                                      |  | Three and nine months endedSeptember 30, |           
|                                      |  | 2008                                     |            |   | 2007 |  
|Purchase Plan                         |  |                                          |            |   |      |   |            |  
|Expected life in years                |  |                                          | 0.5-2.0    |   |      |   | 0.5-2.0    |  
|Risk-free interest rate               |  |                                          | 1.7% - 2.6 | % |      |   | 4.9% - 5.0 | %
|Volatility                            |  |                                          | 47% - 53   | % |      |   | 38% - 46   | %
|Weighted average fair value of grants |  | $                                        | 5.33       |   |      | $ | 11.04      |  

The expected term represents the period that stock-based awards are expected to be outstanding.
For the three and nine months ended September 30, 2008 and September 30, 2007, we have elected to use the simplified method of determining the expected term as permitted by SEC Staff Accounting Bulletin 107 and 110. The computation of
expected volatility for the three and nine months ended September 30, 2008 and 2007 is based on the historical volatility of comparable companies from a representative peer group selected based on industry and market capitalization data. As
required by SFAS No. 123(R), management estimated expected forfeitures and is recognizing compensation costs only for those equity awards expected to vest.

As of September 30, 2008, the total compensation cost related to stock options and RSUs granted under SFAS No. 123(R) but not yet recognized was approximately $111.3 million, net of estimated forfeitures of
$15.4 million. This cost will be amortized on a straight-line basis over the remaining vesting period. Amortization in the three months ended September 30, 2008 and 2007, was $10.4 million and $5.8 million, respectively, and was $28.5 million
and $12.0 million in the nine months ended September 30, 2008 and 2007, respectively.

As of September 30, 2008, there was $4.7
million, net of estimated forfeitures, left to be amortized under our Purchase Plan, which will be amortized over the remaining vesting period, which is 19 months. Amortization in the three months ended September 30, 2008 and 2007 was $2.2
million and $3.0 million, respectively. Amortization in the nine months ended September 30, 2008 and 2007 was $8.2 and $8.5 million, respectively.



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In the second quarter of 2008, we filed a Tender Offer Statement on Schedule TO with the SEC pursuant to
which we extended an offer to non-section 16 officer employees to exchange up to an aggregate of 5,511,495 options to purchase shares of our common stock, whether vested or unvested. Options granted prior to May 1, 2008 with an exercise price
greater than 120% of the closing market price on April 30, 2008 were eligible to be tendered pursuant to the offer. The closing market price on April 30, 2008 was $13.67. In accordance with the Tender Offer (TO), the number of new options
issued was based on an exchange ratio of 0.85 new shares for each share exchanged based on the number of options tendered. A total of 5,246,325 options were tendered and cancelled, and a total of 4,459,392 options were granted on May 30, 2008
at $17.95 per share. The new options retain the vesting schedule of the options exchanged. The TO is subject to modification accounting pursuant to SFAS No. 123(R) whereby the total compensation cost measured at the date of modification is the
portion of the grant-date fair value of the original award for which the requisite service is expected to be rendered (or has already been rendered) at that date plus the incremental cost resulting from the modification. The incremental cost
resulting from the modification is measured as the excess of the fair value of the modified award over the fair value of the original award immediately before its terms are modified. The incremental fair value of $5.5 million for the new awards
was computed using an expected life of 2.5 years to 3.6 years, a risk-free interest rate of 2.4% to 2.6% and a volatility of 48% to 49%. The $407,000 incremental fair value of the vested awards was recognized as compensation expense on the
modification date in the second quarter of 2008. The $5.1 million incremental fair value of the unvested awards will be amortized over the remaining service period.

Accounting for Income Taxes

We use the asset and liability method of accounting for income
taxes in accordance with FASB Statement No. 109, Accounting for Income Taxes. Under this method, income tax expenses or benefits are recognized for the amount of taxes payable or refundable for the current year and for deferred tax
liabilities and assets for the future tax consequences of events that have been recognized in our consolidated financial statements or tax returns. The measurement of current and deferred tax assets and liabilities are based on provisions of
currently enacted tax laws. The effects of future changes in tax laws or rates are not contemplated.

As part of the process of preparing
our consolidated financial statements, we are required to estimate our income tax expense and tax contingencies in each of the tax jurisdictions in which we operate. This process involves estimating current income tax expense together with assessing
temporary differences in the treatment of items for tax purposes versus financial accounting purposes that may create net deferred tax assets and liabilities. We rely on management estimates and assumptions in preparing our income tax provision
including forecasted annual income.

We record a valuation allowance to reduce our deferred tax assets to the amount we believe is more
likely than not to be realized. In assessing the need for a valuation allowance, we have considered our historical levels of income and expectations of future taxable income. In determining future taxable income, we make assumptions to forecast
federal, state and foreign operating income, the reversal of temporary differences, and the implementation of any feasible and prudent tax planning strategies. The assumptions require significant judgment regarding the forecasts of taxable income,
and are consistent with our forecasts used to manage our business.

Because of the uncertainty of the realization of the deferred tax
assets, we have recorded a valuation allowance against our deferred tax assets except for certain deferred tax assets which we can forecast to reverse within a period that will allow us to recover income taxes that were previously paid. The effect
of the potential reversal of these deferred tax assets is included in our estimated annual effective tax rate. Realization of our deferred tax assets is dependent primarily upon future U.S. taxable income.

In the future, we may conclude that it is more likely than not that our deferred tax assets will be realized based on expectations of taxable income and
other factors. This would result in a reduction of the valuation allowance and a decrease to income tax expense for the period such determination is made.

Inventory Valuation

Inventory consists of hardware and related component parts and is stated at the lower of cost
(on a first-in, first-out basis) or market. A portion of our inventory relates to evaluation units located at customer locations, as some of our customers test our equipment prior to purchasing. Inventory that is obsolete or in excess of our
forecasted demand is written down to its estimated realizable value based on historical usage, expected demand, and with respect to evaluation units, the historical conversion rate and age of the units. Inherent in our estimates of market value in
determining inventory valuation are estimates related to economic trends, future demand for our products, the timing of new product introductions and



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technological obsolescence of our products. Inventory write-downs are reflected as cost of product and amounted to approximately $3.3 million and $135,000 in
the three months ended September 30, 2008 and 2007, respectively, and $4.8 million and $935,000 in the nine months ended September 30, 2008 and 2007, respectively.

Warranty Reserve

Upon shipment of products to our customers, we provide for the estimated
cost to repair or replace products that may be returned under warranty. Our warranty period is typically 12 months from the date of shipment to the end-user customer for hardware and 90 days for software. For existing products, the reserve is
estimated based on actual historical experience. For new products, the warranty reserve is based on historical experience of similar products until such time as sufficient historical data has been collected for the new product. Our warranty reserves
liability was approximately $1.4 million and $1.1 million at September 30, 2008 and December 31, 2007, respectively.

The
following is a summary of the warranty reserve activity for the nine months ended September 30, 2008 and 2007:



|                                |  |                                |        |   |      |   |        |  
|------------------------------- |  | ------------------------------ | ------ | - | ---- | - | ------ | -
|                                |  | Nine months endedSeptember 30, |       
|(in thousands)                  |  | 2008                           |        |   | 2007 |  
|Beginning balance               |  | $                              | 1,089  |   |      | $ | 735    |  
|Additions charged to operations |  |                                | 1,569  |   |      |   | 1,692  |  
|Warranty costs incurred         |  |                                | (1,244 | ) |      |   | (1,270 | )
|                                |  |                                |        |   |      |   |        |  
|Ending balance                  |  | $                              | 1,414  |   |      | $ | 1,157  |  
|                                |  |                                |        |   |      |   |        |  

Deferred Inventory Costs

When our products have been delivered, but the product revenue associated with the arrangement has been deferred as a result of not meeting the revenue
recognition criteria in SOP 97-2, we also defer the related inventory costs for the delivered items in accordance with Accounting Research Bulletin 43, Restatement and Revision of Accounting Research Bulletins. Deferred inventory costs
amounted to approximately $2.0 million and $2.3 million at September 30, 2008 and December 31, 2007, respectively, and are included in prepaid expenses and other current assets in the condensed consolidated balance sheets.

Spares

We hold spare parts to service our
customers who purchase support. We classify spare parts as other long term assets and amortize the spares over an estimated useful life of three years. At September 30, 2008 and December 31, 2007 our spare parts balance was $4.1 million
and $2.5 million, respectively. In the three months ended September 30, 2008 and 2007, we amortized $528,000 and $171,000, respectively, to cost of support and services related to spares. In the nine months ended September 30, 2008 and
2007, we amortized $1.3 million and $405,000, respectively.

Concentrations of Risk

Financial instruments that are potentially subject to concentrations of credit risk consist primarily of cash, cash equivalents, marketable securities,
and trade receivables. Investment policies have been implemented that limit investments to investment grade securities and the average portfolio maturity is less than six months. The risk with respect to trade receivables is mitigated by credit
evaluations we perform on our customers and by the diversification of our customer base. One value added reseller represented 11% of our revenue for the three months ended September 30, 2008. No customer represented more than 10% of our revenue
for the nine months ended September 30, 2008 and for the three and nine months ended September 30, 2007.

We outsource the
production of our hardware to third-party manufacturers. We rely on purchase orders or long-term contracts with our contract manufacturers. At September 30, 2008, we had no long-term contractual commitment with any manufacturer; however, we did
have 90 day purchase commitments totaling $12.8 million.



|2. | NET INCOME (LOSS) PER COMMON SHARE
|-- | ----------------------------------

Basic net
income (loss) per common share is computed by dividing net income (loss) by the weighted average number of vested common shares outstanding during the period. Diluted net income (loss) per common share is computed by giving effect to all potential
dilutive common shares.



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The following table sets forth the computation of income (loss) per share:



|                                                                                                                                                                                                                                      |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |       
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ------------------------------- | ------- | ------------------------------ | ---- | - | ------ |  | - | ------- | - |  | - | ------
|                                                                                                                                                                                                                                      |  | Three months endedSeptember 30, |         | Nine months endedSeptember 30,
|(in thousands, except per share data)                                                                                                                                                                                                 |  | 2008                            |         |                                | 2007 |   | 2008   |  |   | 2007   
|Net income (loss)                                                                                                                                                                                                                     |  | $                               | (12,423 | )                              |      | $ | 2,768  |  | $ | (12,654 | ) |  | $ | 9,971 
|                                                                                                                                                                                                                                      |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |       
|Weighted average common shares outstanding - basic                                                                                                                                                                                    |  |                                 | 71,005  |                                |      |   | 69,069 |  |   | 70,915  |   |  |   | 67,397
|Dilutive effect of employee stock plans                                                                                                                                                                                               |  |                                 |        |                                |      |   | 5,291  |  |   |        |   |  |   | 5,537 
|                                                                                                                                                                                                                                      |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |       
|Weighted average common shares outstanding - diluted                                                                                                                                                                                  |  |                                 | 71,005  |                                |      |   | 74,360 |  |   | 70,915  |   |  |   | 72,934
|                                                                                                                                                                                                                                      |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |       
|Basic net income (loss) per share                                                                                                                                                                                                     |  | $                               | (0.17   | )                              |      | $ | 0.04   |  | $ | (0.18   | ) |  | $ | 0.15  
|                                                                                                                                                                                                                                      |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |       
|Diluted net income (loss) per share                                                                                                                                                                                                   |  | $                               | (0.17   | )                              |      | $ | 0.04   |  | $ | (0.18   | ) |  | $ | 0.14  
|                                                                                                                                                                                                                                      |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |       
|The following weighted average outstanding
options and RSUs were excluded from the computation of diluted net income (loss) per common share for the periods presented because including them would have had an anti-dilutive effect:
|                                                                                                                                                                                                                                      |  | Three months endedSeptember 30, |         | Nine months endedSeptember 30,
|(in thousands)                                                                                                                                                                                                                        |  | 2008                            |         |                                | 2007 |   | 2008   |  |   | 2007   
|Stock options and awards outstanding:                                                                                                                                                                                                 |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |       
|In-the-money awards                                                                                                                                                                                                                   |  |                                 | 2,169   |                                |      |   |       |  |   | 2,999   |   |  |   |      
|Out-of-the-money awards                                                                                                                                                                                                               |  |                                 | 9,547   |                                |      |   | 3,471  |  |   | 8,301   |   |  |   | 2,721 
|                                                                                                                                                                                                                                      |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |       
|Total potential shares of common stock excluded from the computation of earning per share                                                                                                                                             |  |                                 | 11,716  |                                |      |   | 3,471  |  |   | 11,300  |   |  |   | 2,721 
|                                                                                                                                                                                                                                      |  |                                 |         |                                |      |   |        |  |   |         |   |  |   |       

Stock options outstanding with an exercise price lower than our average stock price for the
periods presented, RSUs, and Plan Shares (In-the-money awards) that would otherwise have a dilutive effect under the treasury stock method, are excluded from the calculations of the diluted loss per share in periods with a loss since the
effect in such periods would have been anti-dilutive.

Stock options outstanding with an exercise price higher than our average stock price
for the periods presented, (Out-of-the-money awards) are excluded from the calculations of the diluted net income (loss) per share since the effect would have been anti-dilutive under the treasury stock method.



|3. | CASH, CASH EQUIVALENTS, MARKETABLE SECURITIES AND RESTRICTED CASH
|-- | -----------------------------------------------------------------

Cash, Cash Equivalents and Marketable Securities

Cash and cash equivalents consist primarily of highly liquid
investments in money market mutual funds, government sponsored enterprise obligations, treasury bills, commercial paper and other money market securities with remaining maturities at date of purchase of 90 days or less. The carrying value of cash
and cash equivalents at September 30, 2008 and December 31, 2007 was approximately $117.3 million and $163.0 million, respectively, and approximates fair value.

Marketable securities, which are classified as available for sale at September 30, 2008, are carried at fair value, with the unrealized gains and
losses, reported as a separate component of stockholders equity. Marketable securities consist of government sponsored enterprise obligations, treasury bills and corporate bonds and notes. As of September 30, 2008, the fair value of our
marketable securities is determined in accordance with SFAS No. 157, which defines fair value as the exit price in the principal market in which we would transact. Under SFAS No. 157, level 1 instruments are valued based on quoted
market prices in active markets and include treasury bills and money market funds. Level 2 instruments are valued based on quoted prices in markets that are not active, broker or dealer quotations, or alternative pricing sources with reasonable
levels of price transparency and include corporate bonds and notes and government sponsored enterprise obligations. Level 3 instruments are valued based on unobservable inputs that are supported by little or no market activity and reflect our own
assumptions in measuring fair value. We have no level 3 instruments.



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As of September 30, 2008, the fair value measurements of our cash, cash equivalents and marketable
securities consisted of the following:



|                                                       |  |       |         |         |   |         |  |   |        
|------------------------------------------------------ |  | ----- | ------- | ------- | - | ------- |  | - | -------
|(in thousands)                                         |  | Total |         | Level 1 |   | Level 2
|Government sponsored enterprise obligations            |  | $     | 106,679 |         | $ |        |  | $ | 106,679
|Corporate bonds and notes                              |  |       | 49,795  |         |   |        |  |   | 49,795 
|Treasury bills                                         |  |       | 59,265  |         |   | 59,265  |  |   |       
|Money market funds                                     |  |       | 61,060  |         |   | 61,060  |  |   |       
|                                                       |  |       |         |         |   |         |  |   |        
|Total cash equivalents and marketable securities       |  |       | 276,799 |         | $ | 120,325 |  | $ | 156,474
|                                                       |  |       |         |         |   |         |  |   |        
|Cash                                                   |  |       | 4,705   |         |   |         |  |   |        
|                                                       |  |       |         |         |   |         |  |   |        
|Total cash, cash equivalents and marketable securities |  | $     | 281,504 |         |   |         |  |   |        
|                                                       |  |       |         |         |   |         |  |   |        

Restricted Cash

Pursuant to certain lease agreements and as security for our merchant services agreement with our financial institution, we are required to maintain cash reserves, classified as restricted cash. Current restricted
cash totaled $55,000 and $142,000 at September 30, 2008 and December 31, 2007, respectively, and long-term restricted cash totaled $3.5 million at September 30, 2008 and December 31, 2007. Long-term restricted cash is included in
other assets in the condensed consolidated balance sheets and consists primarily of funds held as collateral for letters of credit for the security deposit on the leases of our corporate headquarters. The long-term restricted cash is restricted
until the end of the lease terms on August 30, 2010 and July 31, 2014.



|4. | INVENTORY
|-- | ---------

Inventory consists primarily of hardware
and related component parts and is stated at the lower of cost (on a first-in, first-out basis) or market. Inventory is comprised of the following:



|               |  |                   |        |                  |   |      
|-------------- |  | ----------------- | ------ | ---------------- | - | -----
|(in thousands) |  | September 30,2008 |        | December 31,2007
|Raw materials  |  | $                 | 504    |                  | $ | 513  
|Finished goods |  |                   | 13,292 |                  |   | 8,900
|               |  |                   |        |                  |   |      
|Total          |  | $                 | 13,796 |                  | $ | 9,413
|               |  |                   |        |                  |   |      



|5. | OTHER ACCRUED LIABILITIES
|-- | -------------------------

Other accrued
liabilities consisted of the following:



|                                |  |                   |        |                  |   |      
|------------------------------- |  | ----------------- | ------ | ---------------- | - | -----
|(in thousands)                  |  | September 30,2008 |        | December 31,2007
|Litigation settlement           |  | $                 | 11,000 |                  | $ |     
|Other accrued liabilities       |  |                   | 16,469 |                  |   | 9,381
|                                |  |                   |        |                  |   |      
|Total other accrued liabilities |  | $                 | 27,469 |                  | $ | 9,381
|                                |  |                   |        |                  |   |      



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|6. | DEFERRED REVENUE
|-- | ----------------

Deferred revenue consisted of the
following:



|                              |  |                   |        |                  |   |       
|----------------------------- |  | ----------------- | ------ | ---------------- | - | ------
|(in thousands)                |  | September 30,2008 |        | December 31,2007
|Product                       |  | $                 | 4,395  |                  | $ | 4,406 
|Support and services          |  |                   | 36,056 |                  |   | 22,439
|                              |  |                   |        |                  |   |       
|Deferred revenue, current     |  |                   | 40,451 |                  |   | 26,845
|                              |  |                   |        |                  |   |       
|Deferred revenue, non-current |  |                   | 9,836  |                  |   | 6,634 
|                              |  |                   |        |                  |   |       
|Total deferred revenue        |  | $                 | 50,287 |                  | $ | 33,479
|                              |  |                   |        |                  |   |       

Deferred product revenue relates to arrangements where not all revenue recognition criteria have
been met. Deferred support revenue represents customer payments made in advance for annual support contracts. Support contracts are typically billed on a per annum basis in advance and revenue is recognized ratably over the support period. Deferred
revenue, non-current consists of customer payments made in advance for support contracts with terms of more than 12 months.



|7. | GUARANTEES
|-- | ----------

Our agreements with customers, as well
as our reseller agreements, generally include certain provisions for indemnifying customers and resellers and their affiliated parties against liabilities if our products infringe a third-partys intellectual property rights. To date, we have
not incurred any material costs as a result of such indemnifications and have not accrued any liabilities related to such obligations in our condensed consolidated financial statements.

As permitted or required under Delaware law and to the maximum extent allowable under that law, we have certain obligations to indemnify our officers,
directors and certain key employees for certain events or occurrences while the officer, director or employee is or was serving at our request in such capacity. These indemnification obligations are valid as long as the director, officer or employee
acted in good faith and in a manner the person reasonably believed to be in or not opposed to the best interests of the corporation, and, with respect to any criminal proceeding, had no reasonable cause to believe his or her conduct was unlawful.
The maximum potential amount of future payments we could be required to make under these indemnification obligations is unlimited; however, we have a director and officer insurance policy that mitigates our exposure and enables us to recover a
portion of any future amounts paid.



|8. | LEASE COMMITMENTS
|-- | -----------------

We lease our facilities under
non-cancelable operating lease agreements. Future minimum commitments for these operating leases in place as of September 30, 2008 with a remaining non-cancelable lease term in excess of one year are as follows:



|                                           |  |                   |       
|------------------------------------------ |  | ----------------- | ------
|(in thousands)                             |  | September 30,2008
|2008 (the three months ending December 31) |  | $                 | 1,096 
|2009                                       |  |                   | 5,008 
|2010                                       |  |                   | 4,757 
|2011                                       |  |                   | 5,296 
|2012 and thereafter                        |  |                   | 11,691
|                                           |  |                   |       
|Total                                      |  | $                 | 27,848
|                                           |  |                   |       

The terms of certain lease agreements provide for rental payments on a graduated basis. We
recognize rent expense on the straight-line basis over the lease period and have accrued for rent expense incurred but not paid. Rent expense under operating leases was $1.8 million and $1.5 million for the three months ended September 30, 2008
and 2007, respectively, and $5.2 million and $3.5 million for the nine months ended September 30, 2008 and 2007, respectively.



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On September 26, 2006, we entered into an Agreement of Sublease, or Sublease, for new corporate
headquarters, and on March 21, 2007 entered into another lease agreement to expand our corporate headquarters as well as extend the term of the existing Sublease. The terms of the leases are from February 1, 2007 and March 31, 2007,
respectively, to July 31, 2014. The aggregate minimum lease commitment for the combined leases is $19.7 million and is included in the table above. We have entered into two letters of credit totaling $3.0 million to serve as the security
deposit for the leases, which is included in other assets in the condensed consolidated balance sheet.



|9. | COMMON STOCK
|-- | ------------

Options issued under our stock option
plans are generally for periods not to exceed 10 years and are issued with an exercise price equal to the market value of our common stock on the date of grant, as determined by the last sale price of such stock on the Nasdaq Global Select Market.
Options typically vest either 25% of the shares one year after the options vesting commencement date and the remainder ratably on a monthly basis over the following three years, or ratably on a monthly basis over four years. Options granted
under the 2002 Plan prior to May 31, 2006 have a maximum term of ten years, and beginning May 31, 2006 have a maximum term of seven years. Options granted under the 2006 Plan have a maximum term of seven years. Options granted under the
2006 Director Option Plan prior to March 4, 2008 have a maximum term of ten years, and options granted beginning March 4, 2008 have a maximum term of seven years.

Options granted under the 2002 Plan to the employees in the United States prior to March 28, 2006 were immediately exercisable. For options granted
beginning March 28, 2006, optionees may only exercise vested shares. Any unvested stock issued upon early exercise under the 2002 Plan is subject to repurchase by us. Grants made pursuant to the 2006 Plan do not provide for the early exercise
of options. At September 30, 2008 and December 31, 2007, there were 441,000 and 1,088,000 shares, respectively, subject to repurchase under all common stock repurchase agreements. The cash received from the sale of these shares is
initially recorded as a liability and is subsequently reclassified to common stock as the shares vest. At September 30, 2008 and December 31, 2007, there was $149,000 and $346,000, respectively, recorded in accrued liabilities and other
long-term liabilities related to the issuance of these shares.

In April 2008, we awarded 856,700 RSUs to employees. The RSUs, which upon
vesting entitle the holder to one share of common stock for each RSU, vest over four years. The fair value of the RSUs is based on our stock price on the date of grant, and compensation expense, net of estimated forfeitures, is recognized on a
straight-line basis over the vesting period.

As of September 30, 2008, 1,304,171 shares were available for grant under the 2006 Plan
and the 2006 Director Option Plan.

The Purchase Plan became effective on the effective date of the registration statement relating to our
IPO. Under the Purchase Plan, employees may purchase shares of common stock through payroll deductions at a price per share that is 85% of the lesser of the fair market value of our common stock as of the beginning of an applicable offering period
or the applicable purchase date, with purchases generally every six months. Employees payroll deductions may not exceed 15% of their compensation. Employees may purchase up to 2,000 shares per purchase period provided that the value of the
shares purchased in any calendar year does not exceed IRS limitations. As of September 30, 2008, 1,438,947 shares were available under the Purchase Plan.

On April 21, 2008, our Board of Directors authorized a Share Repurchase Program, or Program, which authorizes us to repurchase and retire up to $100 million of our outstanding common stock during a period not to
exceed 24 months from the Board authorization date. The Program does not require us to purchase a minimum number of shares, and may be suspended, modified or discontinued at any time. For the three months ended September 30, 2008, we
repurchased 753,856 shares of common stock under this Program on the open market for an aggregate purchase price of approximately $12.5 million, or an average of $16.59 per share. For the nine months ended September 30, 2008, we
repurchased 1,548,056 shares of common stock under this Program on the open market for an aggregate purchase price of approximately $25.0 million, or an average of $16.13 per share. The timing and amounts of these purchases were based on market
conditions and other factors including price, regulatory requirements and capital availability. The share repurchases were financed by available cash balances and cash from operations.



|10. | INCOME TAXES
|--- | ------------

Our effective tax rate was
(81.4%) and 41.3% for the three months ended September 30, 2008 and 2007, and (193.0%) and 22.3% for the nine months ended September 30, 2008 and 2007, respectively. Our income tax provision consists of federal, foreign, and
state income taxes.



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Our effective tax rate differs from the federal statutory rate due to state taxes, significant permanent
differences and the valuation allowance on our net deferred tax assets. Significant permanent differences arise from the portion of stock-based compensation expense that is not expected to generate a tax deduction, such as stock compensation expense
on grants to foreign employees, our purchase plan and incentive stock options, offset by the actual tax benefits in the current periods from disqualifying dispositions of our purchase plan shares and incentive stock options. The valuation allowance
on our net deferred tax assets relate to temporary differences between our taxable income in our financial statements and our expected taxable income on our tax returns. Significant temporary differences such as stock-based compensation related to
unexercised non-qualified options and the litigation settlement described in Note 12 generally do not receive a benefit in our tax provision due to the valuation allowance.

The entire tax effect of the litigation settlement, and the associated valuation allowance, was recorded in the tax provision for the three months ended
September 30, 2008 and not included in our estimated annual effective tax rate. As a result, we recorded a significant current tax provision for both the three and nine months ended September 30, 2008 that was not offset by deferred tax
benefits due to the valuation allowance. When compared to our pre-tax loss for the same period, this resulted in a negative effective tax rate.

As of September 30, 2008, our tax provision includes a deferred tax benefit for certain deferred tax assets which we can forecast to reverse within a period that will allow us to recover income taxes that were previously paid.



|11. | SEGMENT INFORMATION
|--- | -------------------

SFAS No. 131,
Disclosures about Segments of an Enterprise and Related Information, establishes standards for reporting information about operating segments. Operating segments are defined as components of an enterprise about which separate financial
information is available that is evaluated regularly by the chief operating decision maker, or decision making group, in deciding how to allocate resources and in assessing performance. Our chief operating decision maker is our Chief Executive
Officer. Our Chief Executive Officer reviews financial information presented on a consolidated basis, accompanied by information about revenue by geographic region for purposes of allocating resources and evaluating financial performance. We have
one business activity and there are no segment managers who are held accountable for operations, operating results and plans for levels or components below the consolidated unit level. Accordingly, we are considered to be in a single reporting
segment and operating unit structure.

Revenue by geography is based on the billing address of the customer. The following table sets forth
revenue by geographic area.

Revenue



|                               |  |                                 |        |                                |   |        |  |      |         |  |   |        
|------------------------------ |  | ------------------------------- | ------ | ------------------------------ | - | ------ |  | ---- | ------- |  | - | -------
|                               |  | Three months endedSeptember 30, |        | Nine months endedSeptember 30,
|(in thousands)                 |  | 2008                            |        | 2007                           |   | 2008   |  | 2007
|United States                  |  | $                               | 54,289 |                                | $ | 38,736 |  | $    | 142,386 |  | $ | 101,198
|Europe, Middle East and Africa |  |                                 | 20,476 |                                |   | 12,661 |  |      | 59,369  |  |   | 33,902 
|Rest of the World              |  |                                 | 11,782 |                                |   | 11,913 |  |      | 39,366  |  |   | 24,996 
|                               |  |                                 |        |                                |   |        |  |      |         |  |   |        
|Total revenue                  |  | $                               | 86,547 |                                | $ | 63,310 |  | $    | 241,121 |  | $ | 160,096
|                               |  |                                 |        |                                |   |        |  |      |         |  |   |        



|12. | LEGAL MATTERS
|--- | -------------

On September 30, 2008, we
entered into a Mutual Release and Settlement Agreement (the Settlement Agreement) with Quantum Corporation, a Delaware corporation (Quantum), and certain affiliates of Quantum. Pursuant to the Settlement
Agreement, we and Quantum have jointly executed and filed dismissals of patent infringement actions brought in the United States District Court for the Northern District of California involving United States Patent Nos. 7,116,249; 5,990,810; and
6,622,164 (collectively, the Litigation Patents, and such actions being hereinafter referred to as the Patent Infringement Actions).

Pursuant to the terms of the Settlement Agreement, we paid Quantum a lump sum of $11.0 million, and the parties, on behalf of themselves and their affiliates, entered into a perpetual covenant not to sue (the
Perpetual Covenant) the other parties, any of their respective affiliates, or, subject to certain qualifications, any of their respective resellers, customers, OEM partners or suppliers (i) alleging infringement of any
patents relating to data de-duplication that a party or any of its affiliates currently owns, has the right to enforce or will acquire or have the right to enforce within five (5) years following the date of the Settlement Agreement, including
the Litigation Patents (collectively, the Subject Patents), or (ii) challenging the validity or enforceability of any Subject Patent.



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In addition to the Perpetual Covenant, the parties to the Settlement Agreement agreed, on behalf of
themselves and their affiliates, for a period of three (3) years, not to file any patent infringement lawsuits against any other party to the Settlement Agreement, their affiliates, or, subject to certain qualifications, any of their respective
resellers, customers, OEM partners or suppliers. In addition, we and Quantum released each other from any and all claims, demands, losses, liabilities and causes of action relating to the Patent Infringement Actions or any infringement of any patent
based on acts occurring prior to the date of the Settlement Agreement.

Please refer to our Current Report on Form 8-K filed with the SEC
on October 1, 2008 for further details.

The $11.0 million settlement was recorded as Other charges in our consolidated statements of
operations for the quarter ended September 30, 2008.

From time to time, we are involved in various legal proceedings, claims and
litigation arising in the ordinary course of business. There are no currently pending legal proceedings at September 30, 2008 that, in the opinion of management, might have a material adverse effect on our financial position, results of
operations or cash flows.



|13. | NEW ACCOUNTING PRONOUNCEMENTS
|--- | -----------------------------

In June 2007, the
FASB ratified EITF 07-3, Accounting for Non-Refundable Advance Payments for Goods or Services Received for Use in Future Research and Development Activities.EITF 07-3 requires that non-refundable advance payments for goods or services that
will be used or rendered for future research and development activities be deferred and capitalized and recognized as an expense as the goods are delivered or the related services are performed. EITF 07-3 is effective, on a prospective basis, for
fiscal years beginning after December 15, 2007. The adoption of EITF 07-3 did not have an impact on our consolidated financial statements.

In September 2006, the FASB issued SFAS No. 157, Fair Value Measurements,which defines fair value, establishes a framework for measuring fair value in accordance with generally accepted accounting principles and expands
disclosures about fair value measurements. SFAS No. 157 became effective for fiscal years beginning after November 15, 2007, and interim periods within those fiscal years. In February 2008, the FASB issued Staff Position (FSP)
No. 157-2, which delayed the effective date of SFAS No. 157 one year for all non-financial assets and non-financial liabilities, except those recognized or disclosed at fair value in the financial statements on a recurring basis. Assets
and liabilities measured at fair value under SFAS No. 157 in the nine months ended September 30, 2008 did not have a material impact on our condensed consolidated financial statements. In accordance with FSP No. 157-2, we will measure
the remaining assets and liabilities no later than the quarter ended March 31, 2009, and have not yet determined the impact of this standard on our consolidated financial statements.



|Item 2. | Managements Discussion and Analysis of Financial Condition and Results of Operations
|------- | -------------------------------------------------------------------------------------

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with the consolidated
financial statements and related notes included elsewhere in this Form 10-Q. The information in this Form 10-Q contains forward-looking statements within the meaning of Section 27A of the Securities Act, and Section 21E of the Exchange
Act. Such statements are based upon current expectations that involve risks and uncertainties. Any statements contained herein that are not statements of historical facts may be deemed to be forward-looking statements. For example, words such as
may, will, should, estimates, predicts, potential, continue, strategy, believes, anticipates, plans,
expects, intends and similar expressions are intended to identify forward-looking statements. Our actual results and the timing of certain events may differ significantly from the results discussed in the forward-looking
statements. Factors that might cause or contribute to such a discrepancy include, but are not limited to, those discussed elsewhere in this Form 10-Q in the section titled Risk Factors and the risks discussed in our other SEC filings. We
disclaim any obligation to publicly release any revisions to the forward-looking statements after the date of this Form 10-Q.

Overview

We were founded in May 2002 by experienced industry leaders with a vision to improve the performance of wide-area distributed
computing. Having significant experience in caching technology, our executive management team understood that existing approaches failed to address adequately all of the root causes of this poor performance. We determined that these performance
problems could be best solved by simultaneously addressing inefficiencies in software applications and wide area networks, or WANs, as well as insufficient or unavailable bandwidth. This innovative approach served as the foundation of the
development of our products. We began commercial shipments of our products in May 2004 and have since sold our products to over 5,000 customers worldwide. We now offer several product lines including Steelhead appliances, Central Management Console,
Interceptor and Steelhead Mobile.



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We are headquartered in San Francisco, California. Our personnel are located throughout the United States
and in over twenty countries worldwide. We expect to continue to add personnel in the United States and internationally to provide additional geographic sales, research and development, general and administrative and technical support coverage.

In September 2006, we completed our IPO, of common stock in which we sold and issued 9,990,321 shares of our common stock at an issue
price of $9.75 per share. We raised a total of $97.4 million in gross proceeds from the IPO, or approximately $87.5 million in net proceeds after deducting underwriting discounts and commissions of $6.8 million and other offering costs of $3.1
million. Upon the closing of the IPO, all shares of convertible preferred stock outstanding automatically converted into 39,441,439 shares of common stock.

In February 2007, we completed a follow-on public offering of common stock in which we sold and issued 2,854,671 shares of our common stock at an issue price of $32.50 per share. As a result of the offering, we raised
a total of $92.8 million in gross proceeds, or approximately $87.7 million in net proceeds after deducting underwriting discounts and commissions of $4.2 million and other offering costs of $0.9 million.

In August 2007, we began selling our Steelhead® Mobile product line, which includes a software client version of our Steelhead appliances, which delivers LAN-like application performance to any employee laptop, whether on the road, working from home or connected
wirelessly in the office.

In February 2008, we announced the Riverbed Services Platform (RSP), which enables the delivery of virtualized
edge services without the need to deploy additional physical servers at remote or branch offices. RSP allows customers to deploy services from an array of vendors on Steelhead appliances in a self-contained partition to minimize the hardware
infrastructure footprint at the branch office.

In August 2008, we introduced the 50 series models of our Steelhead appliances.

We believe that our current value proposition, which enables customers to improve the performance of their applications and access to their data
across WANs, while also offering the ability to simplify IT infrastructure and realize significant capital and operating cost savings, should allow us to grow our business. Our product revenue growth rate will depend significantly on continued
growth in the wide-area data services, or WDS, market and our ability to continue to attract new customers in that market and generate additional sales from existing customers. Our growth in support and services revenue is dependent upon increasing
the number of products under support contracts, which is dependent on both growing our installed base of customers and renewing existing support contracts. Our future profitability and rate of growth will be directly affected by the continued
acceptance of our products in the marketplace, as well as the timing and size of orders, product mix, average selling prices and costs of our products and general economic conditions. Our ability to achieve profitability in the future will also be
affected by the extent to which we must incur additional expenses to expand our sales, support, marketing, development, and general and administrative capabilities to grow our business. The largest component of our expenses is personnel costs.
Personnel costs consist of salaries, benefits and incentive compensation for our employees, including commissions for sales personnel and stock-based compensation.

Revenue. We derive our revenue from sales of our products and support and services. Our revenue has grown rapidly since we began shipping products in May 2004, increasing from $2.6 million in 2004 to
$236.4 million in 2007. Revenue for the three and nine months ended September 30, 2008 was $86.5 million and $241.1 million, respectively, compared to $63.3 million and $160.1 million, for the three and nine months ended September 30,
2007, respectively.

We sell our products directly through our sales force and indirectly through resellers. We derived 93% of our revenue
through indirect channels in the third quarter of 2008. We expect revenue from resellers to continue to constitute a substantial majority of our future revenue.

Cost of Revenue. Cost of product revenue consists of the costs of the appliance hardware, manufacturing personnel, manufacturing, shipping and logistics costs, and expenses for inventory obsolescence and
warranty obligations. We utilize third parties to assist in the design of and to manufacture our appliance hardware, embed our proprietary software and perform shipping logistics. Cost of support and service revenue is primarily comprised of the
personnel costs of providing technical support and professional services, spare parts and logistics services. As we expand internationally and into other sectors, we may incur additional costs to conform our products to comply with local laws or
local product specifications. In addition, as we expand internationally, we will continue to hire additional technical support personnel to support our growing international customer base.



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Gross Margin. Our gross margin has been and will continue to be affected by a variety of
factors, including the mix and average selling prices of our products, new product introductions and enhancements, the cost of our appliance hardware, expenses for inventory obsolescence and warranty obligations, cost of support and service
personnel, and the mix of distribution channels through which our products are sold.

Operating Expenses. Operating expenses
consist of sales and marketing, research and development and general and administrative expenses. Personnel-related costs, including stock-based compensation, are the most significant component of each of these expense categories. We grew from 623
employees at December 31, 2007 to 814 employees at September 30, 2008. The timing of additional hires has and could materially affect our operating expenses, both in absolute dollars and as a percentage of revenue, in any particular
period.

Sales and marketing expenses represent the largest component of our operating expenses and include personnel costs, sales
commissions, marketing programs and facilities costs. Marketing programs are intended to generate revenue from new and existing customers, and are expensed as incurred. We expect sales and marketing expenses to increase as we hire additional
personnel and spend more on marketing programs with the intent to grow our revenue. The majority of our international personnel are engaged in sales, marketing and support activities.

Research and development expenses primarily include personnel costs and facilities costs. We expense research and development expenses as incurred. We
are devoting substantial resources to the continued development of additional functionality for existing products and the development of new products. We intend to continue to invest significantly in our research and development efforts because we
believe they are essential to maintaining our competitive position. Investments in research and development personnel costs are expected to increase in dollar amount.

General and administrative expenses consist primarily of personnel costs related to our executive, finance, human resource, information technology and legal organizations, and fees for professional services.
Professional services include outside legal, audit and information technology consulting costs.

Stock-Based Compensation
Expense. Effective January 1, 2006, we began to measure and recognize compensation expense for all stock-based payments at fair value, in accordance with Statement of Financial Accounting Standard No. 123 (revised 2004)
Share-Based Payment, or SFAS No. 123(R). Prior to the adoption of SFAS No. 123 (R) we accounted for stock options under the intrinsic value method in accordance with Accounting Principles Board Opinion No. 25,
Accounting for Stock Issued to Employees, or APB 25. We expect to continue to incur significant stock-based compensation expense.

Critical
Accounting Policies and Estimates

Our consolidated financial statements are prepared in accordance with United States generally
accepted accounting principles, or GAAP. These accounting principles require us to make certain estimates and judgments that can affect the reported amounts of assets and liabilities as of the date of the consolidated financial statements, as well
as the reported amounts of revenue and expenses during the periods presented. We believe that the estimates and judgments upon which we rely are reasonable based upon information available to us at the time that these estimates and judgments are
made. To the extent there are material differences between these estimates and actual results, our consolidated financial statements could be adversely affected.

The accounting policies that reflect our more significant estimates, judgments and assumptions and which we believe are the most critical to aid in fully understanding and evaluating our reported financial results
include the following: revenue recognition, stock-based compensation, accounting for income taxes, inventory valuation and allowances for doubtful accounts. Please refer to Managements Discussion and Analysis of Financial Condition and Results
of Operations contained in Part II, Item 7 of our Annual Report on Form 10-K for our fiscal year ended December 31, 2007 for a more complete discussion of our critical accounting policies and estimates. Our critical accounting policies
have been discussed with the Audit Committee of the Board of Directors. We believe there have been no material changes to our critical accounting policies and estimates during the three and nine months ended September 30, 2008, compared to
those discussed in our Form 10-K for the year ended December 31, 2007, except as discussed below.

In the second quarter of 2008, we
granted 856,700 RSUs. The fair value of RSUs is based on the closing market price of our common stock on the date of grant and the related compensation expense, net of estimated forfeitures, is amortized on a straight-line basis over the service
period of four years. No RSUs were granted during the third quarter of 2008.



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Results of Operations

Revenue

We derive our revenue from sales of our appliances and software licenses and from support
and services. Product revenue primarily consists of revenue from sales of our Steelhead products and is typically recognized upon shipment. Support and services revenue includes unspecified software license updates and product support. Support
revenue is recognized ratably over the contractual period, which is typically one year. Service revenue includes professional services and training, which to date has not been significant, and is recognized as the services are performed.



|                                |  |                                 |        |                                |   |        |  |      |         |  |   |        
|------------------------------- |  | ------------------------------- | ------ | ------------------------------ | - | ------ |  | ---- | ------- |  | - | -------
|                                |  | Three months endedSeptember 30, |        | Nine months endedSeptember 30,
|(dollars in thousands)          |  | 2008                            |        | 2007                           |   | 2008   |  | 2007
|Total Revenue                   |  | $                               | 86,547 |                                | $ | 63,310 |  | $    | 241,121 |  | $ | 160,096
|Total Revenue by Type:          |  |                                 |        |                                |   |        |  |      |         |  |   |        
|Product                         |  | $                               | 65,238 |                                | $ | 52,508 |  | $    | 185,574 |  | $ | 133,335
|Support and services            |  | $                               | 21,309 |                                | $ | 10,802 |  | $    | 55,547  |  | $ | 26,761 
|% Revenue by Type:              |  |                                 |        |                                |   |        |  |      |         |  |   |        
|Product                         |  |                                 | 75%    |                                |   | 83%    |  |      | 77%     |  |   | 83%    
|Support and services            |  |                                 | 25%    |                                |   | 17%    |  |      | 23%     |  |   | 17%    
|Total Revenue by Geography:     |  |                                 |        |                                |   |        |  |      |         |  |   |        
|United States                   |  | $                               | 54,289 |                                | $ | 38,736 |  | $    | 142,386 |  | $ | 101,198
|Europe, Middle East and Africa  |  | $                               | 20,476 |                                | $ | 12,661 |  | $    | 59,369  |  | $ | 33,902 
|Rest of the World               |  | $                               | 11,782 |                                | $ | 11,913 |  | $    | 39,366  |  | $ | 24,996 
|% Revenue by Geography:         |  |                                 |        |                                |   |        |  |      |         |  |   |        
|United States                   |  |                                 | 63%    |                                |   | 61%    |  |      | 59%     |  |   | 63%    
|Europe, Middle East and Africa  |  |                                 | 24%    |                                |   | 20%    |  |      | 25%     |  |   | 21%    
|Rest of the World               |  |                                 | 13%    |                                |   | 19%    |  |      | 16%     |  |   | 16%    
|Total Revenue by Sales Channel: |  |                                 |        |                                |   |        |  |      |         |  |   |        
|Direct                          |  | $                               | 5,649  |                                | $ | 7,516  |  | $    | 21,003  |  | $ | 16,795 
|Indirect                        |  | $                               | 80,898 |                                | $ | 55,794 |  | $    | 220,118 |  | $ | 143,301
|% Revenue by Sales Channel:     |  |                                 |        |                                |   |        |  |      |         |  |   |        
|Direct                          |  |                                 | 7%     |                                |   | 12%    |  |      | 9%      |  |   | 10%    
|Indirect                        |  |                                 | 93%    |                                |   | 88%    |  |      | 91%     |  |   | 90%    

Quarter Ended September 30, 2008 Compared to the Quarter Ended September 30,
2007: Product revenue increased in the three months ended September 30, 2008 as compared to the three months ended September 30, 2007 due primarily to an increase in unit volume from increasing sales to existing customers and the
addition of new customers. We believe the market for our products has grown due to increased market awareness of wide-area data services and distributed organizations, which increases dependence on timely access to data and applications.

Substantially all of our customers purchase support when they purchase our products. The increase in support and services revenue on an absolute basis
and as a percentage of total revenues is a result of increased product and first year support sales combined with the renewal of support contracts by existing customers. As our customer base grows, we expect the proportion of revenue generated from
support and services to increase.

In the three months ended September 30, 2008, we derived 93% of our revenue from indirect channels
compared to 88% in the three months ended September 30, 2007. We expect indirect channel revenue to continue to be a significant portion of our revenue.

We generated 37% of our revenue in the three months ended September 30, 2008 from international locations, compared to 39% in the three months ended September 30, 2007. We continue to expand into
international locations and introduce our products in new markets and expect international revenue to increase in dollar amount over time.

Nine Months Ended September 30, 2008 Compared to the Nine Months Ended September 30, 2007: Product revenue increased in the nine months ended September 30, 2008 due primarily to an increase in new customers and
additional purchases by existing customers.



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Support and services revenue increased in the nine months ended September 30, 2008 in line with the
increase in product revenue and the renewal of support contracts for existing customers.

Cost of Revenue and Gross Margin

Cost of product revenue consists of the costs of appliance hardware, manufacturing, shipping and logistics costs and expenses for
inventory obsolescence and warranty obligations. Cost of support and service revenue consists of salary and related costs of technical support and professional services personnel, spare parts and logistics services.



|                                      |  |                                 |        |                                |   |        |  |      |         |  |   |        
|------------------------------------- |  | ------------------------------- | ------ | ------------------------------ | - | ------ |  | ---- | ------- |  | - | -------
|                                      |  | Three months endedSeptember 30, |        | Nine months endedSeptember 30,
|(dollars in thousands)                |  | 2008                            |        | 2007                           |   | 2008   |  | 2007
|Revenue:                              |  |                                 |        |                                |   |        |  |      |         |  |   |        
|Product                               |  | $                               | 65,238 |                                | $ | 52,508 |  | $    | 185,574 |  | $ | 133,335
|Support and services                  |  |                                 | 21,309 |                                |   | 10,802 |  |      | 55,547  |  |   | 26,761 
|                                      |  |                                 |        |                                |   |        |  |      |         |  |   |        
|Total revenue                         |  |                                 | 86,547 |                                |   | 63,310 |  |      | 241,121 |  |   | 160,096
|                                      |  |                                 |        |                                |   |        |  |      |         |  |   |        
|Cost of revenue:                      |  |                                 |        |                                |   |        |  |      |         |  |   |        
|Cost of product                       |  |                                 | 16,653 |                                |   | 14,029 |  |      | 45,153  |  |   | 37,053 
|Cost of support and services          |  |                                 | 7,174  |                                |   | 4,111  |  |      | 20,151  |  |   | 9,999  
|                                      |  |                                 |        |                                |   |        |  |      |         |  |   |        
|Total cost of revenue                 |  |                                 | 23,827 |                                |   | 18,140 |  |      | 65,304  |  |   | 47,052 
|                                      |  |                                 |        |                                |   |        |  |      |         |  |   |        
|Gross profit                          |  | $                               | 62,720 |                                | $ | 45,170 |  | $    | 175,817 |  | $ | 113,044
|                                      |  |                                 |        |                                |   |        |  |      |         |  |   |        
|Gross margin for product              |  |                                 | 74%    |                                |   | 73%    |  |      | 76%     |  |   | 72%    
|Gross margin for support and services |  |                                 | 66%    |                                |   | 62%    |  |      | 64%     |  |   | 63%    
|Total gross margin                    |  |                                 | 72%    |                                |   | 71%    |  |      | 73%     |  |   | 71%    

Quarter Ended September 30, 2008 Compared to the Quarter Ended September 30,
2007: The increase in cost of product revenue was due primarily to increased unit volume associated with higher revenue. Cost of product revenue in the three months ended September 30, 2008 also includes $3.3 million in provisions for
inventory on hand in excess of forecasted demand. In the same period of the prior year, inventory obsolescence costs were $135,000. The increase in the provision for inventory is related to the write down of legacy inventory as we transition to the
50 series Steelhead appliances. Cost of support and services revenue increased as we added more technical support headcount domestically and abroad to support our growing customer base. Technical support and services headcount was 100 employees as
of September 30, 2008 compared to 60 employees as of September 30, 2007.

Gross margins increased to 72% in the three months
ended September 30, 2008 from 71% in the three months ended September 30, 2007. Gross margin for product increased primarily due to higher margins on product revenue as a result of lower unit product costs as well as favorable product mix.
Gross margin for product in the three months ended September 30, 2008 was negatively affected by approximately 5% due to the inventory obsolescence costs. Gross margin for support and services increased as a result of revenues increasing at a
higher rate than support and services costs. This increase was slightly offset by a decrease in support margins of approximately 1% as a result of stock-based compensation, which was $1.1 million in the three months ended September 30, 2008,
compared to $806,000 in the three months ended September 30, 2007.

Nine Months Ended September 30, 2008 Compared to the Nine
Months Ended September 30, 2007: The increase in the cost of product revenue was due primarily due to increased unit volume associated with higher revenue. Cost of product revenue in the nine months ended September 30, 2008
includes $4.8 million in provisions for inventory on hand in excess of forecasted demand. Inventory obsolescence costs in the nine months ended September 30, 2007 were $935,000. Cost of support and services revenue increased due to increased
personnel related costs as a result of increased headcount.

Gross margins increased to 73% in the nine months ended September 30,
2008 from 71% in the nine months ended September 30, 2007 primarily due to higher margins on product revenue primarily as a result of lower unit product costs, partially offset by higher obsolescence costs. Gross margins for support and
services increased to 64% as a result of revenues increasing at a higher rate than support and services costs. This increase was slightly offset by a decrease in support margins of approximately 3% as a result of stock-based compensation, which was
$3.5 million in the nine months ended September 30, 2008, compared to $1.8 million in the nine months ended September 30, 2007.



20



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##### Table of Contents

Sales and Marketing Expenses

Sales and marketing expenses primarily include personnel costs, sales commissions, marketing programs and facilities costs.



|                             |  |                                 |        |   |                                |   |        |      |  |   |         |   |  |   |        |  
|---------------------------- |  | ------------------------------- | ------ | - | ------------------------------ | - | ------ | ---- |  | - | ------- | - |  | - | ------ | -
|                             |  | Three months endedSeptember 30, |        |   | Nine months endedSeptember 30, |  
|(dollars in thousands)       |  | 2008                            |        |   | 2007                           |   |        | 2008 |  |   | 2007    |  
|Sales and marketing expenses |  | $                               | 34,855 |   |                                | $ | 25,139 |      |  | $ | 100,992 |   |  | $ | 63,035 |  
|Percent of total revenue     |  |                                 | 40     | % |                                |   | 40     | %    |  |   | 42      | % |  |   | 39     | %

Quarter Ended September 30, 2008 Compared to the Quarter Ended September 30,
2007: The increase in sales and marketing expenses was primarily due to an increase in the number of sales and marketing employees, as sales and marketing headcount grew to 379 employees as of September 30, 2008 from 250 employees as of
September 30, 2007. The increase in employees resulted in higher salary expense and employee related benefits. Additionally, commission expense increased in the three months ended September 30, 2008 as compared to the three months ended
September 30, 2007 due to increased revenue and personnel. Salaries and related benefits, bonuses and commissions accounted for $6.4 million, marketing related activities accounted for $489,000, facilities and information technology expenses
accounted for $561,000 and travel and entertainment expenses accounted for $512,000 of the $9.7 million increase in sales and marketing expenses. Stock-based compensation, which was $5.9 million in the three months ended September 30, 2008
compared to $4.5 million in the three months ended September 30, 2007, accounted for approximately $1.4 million of the increase in sales and marketing expenses.

We plan to continue to make investments in sales and marketing with the intent to add new customers and increase penetration within our existing customer base by increasing the number of sales personnel worldwide,
expanding our domestic and international sales and marketing activities, increasing channel penetration, building brand awareness and sponsoring additional marketing events. We expect future sales and marketing expenses to continue to increase and
continue to be our most significant operating expense. Generally, sales personnel are not immediately productive and sales and marketing expenses do not immediately result in increased revenue. Hiring additional sales personnel reduces short-term
operating margins until the sales personnel become productive and generate revenue. Accordingly, the timing of sales personnel hiring and the rate at which they become productive will affect our future performance.

Nine Months Ended September 30, 2008 Compared to the Nine Months Ended September 30, 2007: The increase in sales and marketing
expenses was primarily due to an increase in the number of sales and marketing employees. The increase in employees resulted in higher salary expense and employee related benefits. Additionally, commission expense increased in the nine months ended
September 30, 2008 as compared to the nine months ended September 30, 2007 due to the increase in revenue and additional personnel. Salaries and related benefits, bonuses and commissions accounted for $21.4 million, marketing related
activities accounted for $2.2 million, facilities and information technology expenses accounted for $2.8 million, and travel and entertainment expenses accounted for $2.5 million of the $38.0 million increase in sales and marketing expenses.
Stock-based compensation, which was $17.9 million in the nine months ended September 30, 2008 compared to $10.7 million in the nine months ended September 30, 2007, accounted for approximately $7.2 million of the increase in sales and
marketing expenses.

Research and Development Expenses

Research and development expenses primarily consist of personnel costs and facilities costs. We expense research and development expenses as incurred.



|                                  |  |                                 |        |   |                                |   |        |      |  |   |        |   |  |   |        |  
|--------------------------------- |  | ------------------------------- | ------ | - | ------------------------------ | - | ------ | ---- |  | - | ------ | - |  | - | ------ | -
|                                  |  | Three months endedSeptember 30, |        |   | Nine months endedSeptember 30, |  
|(dollars in thousands)            |  | 2008                            |        |   | 2007                           |   |        | 2008 |  |   | 2007   |  
|Research and development expenses |  | $                               | 14,582 |   |                                | $ | 10,890 |      |  | $ | 43,278 |   |  | $ | 27,384 |  
|Percent of total revenue          |  |                                 | 17     | % |                                |   | 17     | %    |  |   | 18     | % |  |   | 17     | %

Quarter Ended September 30, 2008 Compared to the Quarter Ended September 30,
2007: Research and development expenses increased in the three months ended September 30, 2008 compared to the three months ended September 30, 2007 due to an increase in personnel and facility-related costs as a result of research and
development headcount increasing to 234 employees as of September 30, 2008 from 168 employees as of September 30, 2007. Salaries, bonuses and related benefits accounted for $1.9 million and facilities and related costs accounted for
$344,000 of the $3.7 million increase in research and development expenses. Stock-based compensation, which was $3.4 million in the three months ended September 30, 2008



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compared to $2.5 million in the three months ended September 30, 2007, accounted for $900,000 of the increase in research and development expenses. We
plan to continue to invest in research and development as we develop new products and make further enhancements to existing models.

Nine Months Ended September 30, 2008 Compared to the Nine Months Ended September 30, 2007: Research and development expenses increased in the nine months ended September 30, 2008 compared to the nine months ended
September 30, 2007 due to an increase in personnel and facility-related costs. Salaries, bonuses and related benefits accounted for $7.3 million and facilities and related costs accounted for $1.9 million of the $15.9 million increase in
research and development expenses. Stock-based compensation, which was $9.9 million in the nine months ended September 30, 2008 compared to $6.0 million in the nine months ended September 30, 2007, accounted for $3.9 million of the
increase in research and development expenses.

General and Administrative Expenses

General and administrative expenses consist primarily of compensation for personnel and facilities costs related to our executive, finance, human
resources, information technology and legal organizations, and fees for professional services. Professional services include legal, audit and information technology consulting costs.



|                                    |  |                                 |        |                                |   |       |  |      |        |  |   |       
|----------------------------------- |  | ------------------------------- | ------ | ------------------------------ | - | ----- |  | ---- | ------ |  | - | ------
|                                    |  | Three months endedSeptember 30, |        | Nine months endedSeptember 30,
|(dollars in thousands)              |  | 2008                            |        | 2007                           |   | 2008  |  | 2007
|General and administrative expenses |  | $                               | 10,419 |                                | $ | 7,177 |  | $    | 29,925 |  | $ | 16,814
|Percent of total revenue            |  |                                 | 12%    |                                |   | 11%   |  |      | 12%    |  |   | 11%   

Quarter Ended September 30, 2008 Compared to the Quarter Ended September 30,
2007: The increase in general and administrative expenses for the three months ended September 30, 2008 compared to the three months ended September 30, 2007 is due to an increase in personnel costs, primarily as a result of headcount
increasing to 95 employees as of September 30, 2008 from 69 employees as of September 30, 2007, and an increase in professional services fees. Salaries, bonuses and related benefits accounted for $629,000 and professional service fees
accounted for approximately $1.6 million of the $3.2 million increase in general and administrative expenses. Professional service fees increased primarily due to increased intellectual property (IP) related legal fees associated with IP
litigation. Legal fees associated with the IP litigation were $2.0 million in the quarter ended September 30, 2008. Legal fees are expected to decrease now that the IP litigation is resolved. Stock-based compensation, which was $2.5 million in
the three months ended September 30, 2008 compared to $1.6 million in the three months ended September 30, 2007, accounted for approximately $948,000 of the increase in general and administrative expenses.

Nine Months Ended September 30, 2008 Compared to the Nine Months Ended September 30, 2007:The increase in general and administrative
expenses for the nine months ended September 30, 2008 compared to the nine months ended September 30, 2007 is due to an increase in personnel costs and professional services fees. Salaries, bonuses and related benefits accounted for $2.7
million and professional service fees accounted for approximately $5.4 million of the $13.1 million increase in general and administrative expenses. Professional service fees increased due to increased audit and tax advisory fees, information
technology consulting fees and increased legal fees. Legal fees associated with IP litigation were $4.3 million in the nine months ended September 30, 2008. Stock-based compensation, which was $6.8 million in the nine months ended
September 30, 2008 compared to $3.6 million in the nine months ended September 30, 2007, accounted for approximately $3.2 million of the increase in general and administrative expenses.

Other charges

On September 30,
2008, we entered into a mutual release and settlement agreement (the Settlement Agreement) with Quantum Corporation, (Quantum), whereby we agreed to jointly execute and file dismissals of patent infringement
actions brought in the United States District Court for the Northern District of California. Pursuant to the terms of the Settlement Agreement, the Company will pay Quantum a lump sum of $11.0 million, and the parties entered into a perpetual
covenant not to sue related to the patents in question and any patents related to data de-duplication as well as a three year covenant not to file any patent infringement lawsuits. In addition, the Company and Quantum released each other from any
and all claims, demands, losses, liabilities and causes of action relating to any infringement of any patent based on acts occurring prior to the date of the Settlement Agreement. Based on the terms of the Settlement Agreement we recorded operating
expense of $11.0 million in the third quarter of 2008.



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Other Income, Net

Other income, net consists primarily of interest income, and foreign currency exchange losses.



|                        |  |                                 |       |   |                                |   |       |      |  |   |       |   |  |   |       |  
|----------------------- |  | ------------------------------- | ----- | - | ------------------------------ | - | ----- | ---- |  | - | ----- | - |  | - | ----- | -
|                        |  | Three months endedSeptember 30, |       |   | Nine months endedSeptember 30, |  
|(dollars in thousands)  |  | 2008                            |       |   | 2007                           |   |       | 2008 |  |   | 2007  |  
|Interest income         |  | $                               | 1,507 |   |                                | $ | 2,866 |      |  | $ | 5,440 |   |  | $ | 7,293 |  
|Other                   |  |                                 | (220  | ) |                                |   | (112  | )    |  |   | (381  | ) |  |   | (265  | )
|                        |  |                                 |       |   |                                |   |       |      |  |   |       |   |  |   |       |  
|Total other income, net |  | $                               | 1,287 |   |                                | $ | 2,754 |      |  | $ | 5,059 |   |  | $ | 7,028 |  
|                        |  |                                 |       |   |                                |   |       |      |  |   |       |   |  |   |       |  

Quarter Ended September 30, 2008 Compared to the Quarter Ended September 30,
2007: Other income, net, decreased in the three months ended September 30, 2008 due to decreased interest income on cash and marketable securities balances as a result of declining interest rates. Weighted average interest rates applicable
to our cash and marketable securities balances decreased to 2.2% in the three months ended September 30, 2008 compared to 5.2% in the three months ended September 30, 2007.

Nine Months Ended September 30, 2008 Compared to the Nine Months Ended September 30, 2007: Other income, net, decreased in the
nine months ended September 30, 2008 due to decreased interest income on cash and marketable securities balances as a result of declining interest rates. Weighted average interest rates applicable to our cash and marketable securities balances
decreased to 2.8% in the nine months ended September 30, 2008 compared to 5.1% in the nine months ended September 30, 2007.

Provision for Income Taxes

The provision for income taxes for the three months ended September 30, 2008 and 2007 was
$5.6 million and $2.0 million, respectively, and for the nine months ended September 30, 2008 and 2007 was $8.3 million and $2.9 million, respectively. Our income tax provision consists of federal, foreign, and state income taxes. Our effective
tax rate was (81.4%) and 41.3% for the three months ended September 30, 2008 and 2007, respectively, and (193.0%) and 22.3% for the nine months ended September 30, 2008 and 2007, respectively.

Our effective tax rate differs from the federal statutory rate due to state taxes, significant permanent differences and the valuation allowance on our
net deferred tax assets. Significant permanent differences arise from the portion of stock-based compensation expense that is not expected to generate a tax deduction, such as stock compensation expense on grants to foreign employees, our purchase
plan and incentive stock options, offset by the actual tax benefits in the current periods from disqualifying dispositions of those shares. The valuation allowance on our net deferred tax assets relate to temporary difference between our taxable
income in our financial statements and our expected taxable income on our tax returns. Significant temporary differences such as stock-based compensation related to unexercised non-qualified options and the litigation settlement generally do not
receive a benefit in our tax provision due to the valuation allowance.

The entire tax effect of the litigation settlement, and the
associated valuation allowance, was recorded in the tax provision for the three months ended September 30, 2008 and not included in our estimated annual effective tax rate. As a result, we recorded a significant current tax provision for both
the three and nine months ended September 30, 2008 that was not offset by deferred tax benefits due to the valuation allowance. When compared to our pre-tax loss for the same period, this resulted in a negative effective tax rate.

Our tax provision in the three and nine months ended September 2007 benefited from federal and state net operating loss carryforwards and tax credit
carryforwards.

We expect our effective tax rate in 2008 to fluctuate significantly on a quarterly basis. The effective tax rate could be
affected by our stock-based compensation expense, by changes in the valuation of our deferred tax assets, changes in actual results versus our estimates, or by changes in tax laws, regulations, accounting principles, or interpretations thereof. In
October of 2008, the federal research and development tax credit was reinstated. The impact of the credit on our effective tax rate will be reflected in the quarter ending December 31, 2008.

We record a valuation allowance to reduce our deferred tax assets to the amount we believe is more likely than not to be realized. In assessing the need
for a valuation allowance, we have considered our historical levels of income and expectations of future taxable income. In determining future taxable income, we make assumptions to forecast federal, state and international operating income, the
reversal of temporary differences, and the implementation of any feasible and prudent tax planning strategies. The assumptions require significant judgment regarding the forecasts of taxable income, and are consistent with our forecasts used to
manage our business.



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Because of the uncertainty of the realization of the deferred tax assets, we have recorded a valuation
allowance against our deferred tax assets except for those items which we can forecast to reverse within a period that will allow us to recover income taxes that were previously paid. The effect of the expected reversal of these deferred tax assets
is included in our estimated annual effective tax rate. Realization of our remaining deferred tax assets will be dependent primarily upon future U.S. taxable income.

In the future, we may conclude that it is more likely than not that our deferred tax assets will be realized based on expectations of taxable income and other factors. This would result in a reduction of the valuation
allowance and a decrease to income tax expense for the period such determination is made.

Liquidity and Capital Resources



|                                                |  |                                |         |   |                       |   |         |  
|----------------------------------------------- |  | ------------------------------ | ------- | - | --------------------- | - | ------- | -
|(in thousands)                                  |  | As ofSeptember 30,2008         |         |   | As ofDecember 31,2007 |  
|Working capital                                 |  | $                              | 250,475 |   |                       | $ | 241,135 |  
|Cash and cash equivalents                       |  | $                              | 117,324 |   |                       | $ | 162,979 |  
|Marketable securities                           |  | $                              | 164,180 |   |                       | $ | 83,103  |  
|                                                | 
|                                                |  | Nine months endedSeptember 30, |        
|(in thousands)                                  |  | 2008                           |         |   | 2007                  |  
|Cash provided by operating activities           |  | $                              | 62,399  |   |                       | $ | 35,125  |  
|Cash used in investing activities               |  | $                              | (93,439 | ) |                       | $ | (65,959 | )
|Cash provided by (used in) financing activities |  | $                              | (14,446 | ) |                       | $ | 94,775  |  

Cash and Cash Equivalents

Cash and cash equivalents consist of money market mutual funds, government sponsored enterprise obligations, treasury bills, commercial paper and other
money market securities with remaining maturities at date of purchase of 90 days or less.

Marketable securities consist of government
sponsored enterprise obligations, treasury bills and corporate bonds and notes. As of March 31, 2008, the fair value of marketable securities is determined in accordance with SFAS No. 157, which defines the fair value as the exit price in
the principal market in which we would transact. The fair value of our marketable securities has not materially fluctuated from historical cost. The accumulated unrealized losses on marketable securities recognized in accumulated other comprehensive
income (loss) in our stockholders equity is approximately $211,000. The recent volatility in the credit markets has increased the risk of material fluctuations in the fair value of marketable securities.

Cash and cash equivalents, and marketable securities increased by $35.4 million to $281.5 million in the nine month period ended September 30, 2008.

Pursuant to certain lease agreements and as security for our merchant services agreement with our financial institution, we are required
to maintain cash reserves, classified as restricted cash. Current restricted cash totaled $55,000 at September 30, 2008 and $142,000 at December 31, 2007, and long-term restricted cash totaled $3.5 million at September 30, 2008 and
December 31, 2007. Long-term restricted cash is included in other assets in the condensed consolidated balance sheets and consists primarily of funds held as collateral for letters of credit for the security deposit on the leases of our
corporate headquarters and is restricted until the end of the lease terms on August 30, 2010 and July 31, 2014.

Since the fourth
quarter of 2004, we have expanded our operations internationally. Our sales contracts are principally denominated in United States dollars and therefore changes in foreign exchange rates have not affected our cash flows from operations. As we fund
our international operations, our cash and cash equivalents are affected by changes in exchange rates. To date, the foreign currency effect on our cash and cash equivalents has not been material.

Cash Flows from Operating Activities

Our largest source of operating cash flows is cash collections from our customers. Our primary uses of cash from operating activities are for personnel related expenditures, product costs, outside services, and rent payments. Our cash flows
from operating activities will continue to be affected principally by the extent to which we grow our revenue and spend on hiring personnel in order to grow our business. The timing of hiring sales personnel in particular affects cash flows as there
is a lag between the hiring of sales personnel and the generation of revenue and cash flows from sales personnel.



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Cash provided by operating activities was $62.4 million in the nine months ended September 30, 2008
compared to $35.1 million in the nine months ended September 30, 2007 primarily due to increased profitability after excluding the effects of non-cash stock-based compensation expense and lower accounts receivable balances due to increased
collections.

Cash Flows from Investing Activities

Cash flows used in investing activities primarily relate to investments in marketable securities and capital expenditures to support our growth.

Cash used in investing activities increased in the nine months ended September 30, 2008 compared to the nine months ended September 30, 2007
primarily due to additional purchases of marketable securities and additional capital expenditures.

Cash Flows from Financing
Activities

Cash flows from financing activities in the nine months ended September 30, 2008 consisted of repurchases of common
stock and proceeds and tax benefits received from the exercise of stock options and stock purchases under our Purchase Plan.

On
April 21, 2008, our Board of Directors authorized a Share Repurchase Program, which authorizes us to repurchase up to $100 million of our outstanding common stock during a period not to exceed 24 months from the Board authorization date. The
Program does not require us to purchase a minimum number of shares, and may be suspended, modified or discontinued at any time. During the third quarter of 2008, we repurchased 753,856 shares of common stock under this Program for an aggregate
purchase price of approximately $12.5 million, or an average of $16.59 per share. The timing and amounts of these repurchases were based on market conditions and other factors including price, regulatory requirements and capital availability. The
share repurchases were financed by available cash balances and cash from operations.

We believe that our net proceeds from operations,
together with our cash balance at September 30, 2008, will be sufficient to fund our projected operating requirements for at least the next 12 months. Our future capital requirements will depend on many factors, including our rate of revenue
growth, the expansion of our sales and marketing activities, the timing and extent of expansion into new territories, the timing of introductions of new products and enhancements to existing products, and the continuing market acceptance of our
products. We may enter into arrangements for potential investments in, or acquisitions of, complementary businesses, services or technologies, which also could require us to seek additional equity or debt financing. Additional funds may not be
available on terms favorable to us or at all.

Contractual Obligations

The following is a summary of our contractual obligations as of September 30, 2008:



|                              |  |                |        |                             |   |        |  |      |       |      |   |                |  |   |       |  |   |       
|----------------------------- |  | -------------- | ------ | --------------------------- | - | ------ |  | ---- | ----- | ---- | - | -------------- |  | - | ----- |  | - | ------
|                              |  | Total          |        | Remainingthreemonths of2008 |   | 2009   |  | 2010 |       | 2011 |   | 2012 andbeyond
|                              |  | (in thousands)
|Contractual Obligations       |  |                |        |                             |   |        |  |      |       |      |   |                |  |   |       |  |   |       
|Operating leases              |  | $              | 27,848 |                             | $ | 1,096  |  | $    | 5,008 |      | $ | 4,757          |  | $ | 5,296 |  | $ | 11,691
|Purchase obligations (1)      |  | $              | 13,428 |                             |   | 12,988 |  |      | 413   |      |   | 27             |  |   |      |  |   |      
|                              |  |                |        |                             |   |        |  |      |       |      |   |                |  |   |       |  |   |       
|Total contractual obligations |  | $              | 41,276 |                             | $ | 14,084 |  | $    | 5,421 |      | $ | 4,784          |  | $ | 5,296 |  | $ | 11,691
|                              |  |                |        |                             |   |        |  |      |       |      |   |                |  |   |       |  |   |       



|(1) | Represents amounts associated with agreements that are enforceable, legally binding and specify terms, including: fixed or minimum quantities to be purchased; fixed, minimum or
variable price provisions; and the approximate timing of payment. Obligations under contracts that we can cancel without a significant penalty are not included in the table above.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Off-Balance Sheet Arrangements

At September 30,
2008 and December 31, 2007, we did not have any relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities, which would have been established for
the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes, nor did we have any undisclosed material transactions or commitments involving related persons or entities.



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Other

At September 30, 2008 and December 31, 2007, we did not have commercial commitments under lines of credit, standby repurchase obligations or other such debt arrangements.

Recent Accounting Pronouncements

See Note 13 of
Notes to Consolidated Financial Statements for recent accounting pronouncements that could have an effect on us.



|Item 3. | Quantitative and Qualitative Disclosures about Market Risk
|------- | ----------------------------------------------------------

Foreign Currency Risk

Our sales contracts are principally denominated in United States dollars and therefore our revenue
and receivables are not subject to significant foreign currency risk. We do incur certain operating expenses in currencies other than the U.S. dollar and therefore are subject to volatility in cash flows due to fluctuations in foreign currency
exchange rates, particularly changes in the British pound, Euro, Australian dollar and Singapore dollar. To date, we have not entered into any hedging contracts since exchange rate fluctuations have had minimal impact on our operating results and
cash flows. We sell predominantly in U.S. dollars, and the recent increase in value of the U.S. dollar relative to most other major currencies may negatively affect our sales as any foreign currency devaluation against the U.S. dollar would increase
the real cost of our products to our customers and partners in foreign markets where we sell in U.S. dollars. In addition, sales would be negatively affected if we chose to more heavily discount our product price in foreign markets to maintain
competitive pricing.

Interest Rate Sensitivity

We had unrestricted cash and cash equivalents totaling $117.3 million and $163.0 million at September 30, 2008 and December 31, 2007, respectively. The unrestricted cash and cash equivalents are held for
working capital purposes. We do not enter into investments for trading or speculative purposes. Cash and cash equivalents include highly liquid investments with a maturity of ninety days or less at the time of purchase. Cash equivalents consist
primarily of money market mutual funds, government sponsored enterprise obligations, treasury bills, and other money market securities. Due to the high investment quality and short duration of these investments, we do not believe that we have
any material exposure to changes in the fair market value as a result of changes in interest rates. Declines in interest rates, however, will reduce future investment income. The recent volatility in the credit markets has caused a macro shift
in investments into highly liquid short term investments such as U.S. Treasury bills. This has caused a significant decline in short term interest rates, which we expect will reduce future investment income. In addition, the volatility in the credit
markets increases the risk of write-downs of investments to fair market value.



|Item 4. | Controls and Procedures
|------- | -----------------------

Evaluation of Disclosure Controls and
Procedures

We evaluated the effectiveness of the design and operation of our disclosure controls and procedures as of
September 30, 2008, the end of the period covered by this report on Form 10-Q. This controls evaluation was done under the supervision and with the participation of our management, including our Chief Executive Officer (CEO) and Chief
Financial Officer (CFO) as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act.

Disclosure controls and procedures are
designed to provide reasonable assurance that information required to be disclosed in the reports that we file or submit under the Securities Exchange Act of 1934, such as this report on Form 10-Q, is recorded, processed, summarized and
reported within the time periods specified in the Securities and Exchange Commissions rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed such that information is accumulated and
communicated to our management, including the CEO and CFO, as appropriate to allow timely decisions regarding required disclosure.

Based
upon the controls evaluation, our CEO and CFO have concluded that as of September 30, 2008, our disclosure controls and procedures were effective to provide reasonable assurance that information required to be disclosed in our Exchange Act
reports is recorded, processed, summarized and reported within the time periods specified by the Securities and Exchange Commission and to ensure that material information relating to us and our consolidated subsidiaries is made known to management,
including the CEO and CFO.



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Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting that occurred during the third quarter of 2008 that have materially affected, or
are reasonably likely to materially affect, our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act). Internal control over financial reporting means a process designed to provide reasonable
assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles.

Inherent Limitations of Internal Controls

Our management, including our CEO and CFO, does not expect
that our disclosure controls and procedures or our internal controls over financial reporting will prevent or detect all error and all fraud. A control system, no matter how well designed and operated, can provide only reasonable, not absolute,
assurance that the objectives of the control system are met. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within the
Company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns can occur because of a simple error or mistake. Additionally, controls can be circumvented by the
individual acts of some persons, by collusion of two or more people, or by management override of the controls. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can
be no assurance that any design will succeed in achieving its stated goals under all potential future conditions. Over time, controls may become inadequate because of changes in conditions, or the degree of compliance with the policies or procedures
may deteriorate. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected.

PART II. OTHER INFORMATION



|Item 1. | Legal Proceedings
|------- | -----------------

On September 30, 2008, we
entered into a Mutual Release and Settlement Agreement (the Settlement Agreement) with Quantum Corporation, a Delaware corporation (Quantum), and certain affiliates of Quantum. Pursuant to the Settlement
Agreement, we and Quantum have jointly executed and filed dismissals of patent infringement actions brought in the United States District Court for the Northern District of California involving United States Patent Nos. 7,116,249; 5,990,810; and
6,622,164 (collectively, the Litigation Patents, and such actions being hereinafter referred to as the Patent Infringement Actions).

Pursuant to the terms of the Settlement Agreement, we paid Quantum a lump sum of $11.0 million, and the parties, on behalf of themselves and their affiliates, entered into a perpetual covenant not to sue (the
Perpetual Covenant) the other parties, any of their respective affiliates, or, subject to certain qualifications, any of their respective resellers, customers, OEM partners or suppliers (i) alleging infringement of any
patents relating to data de-duplication that a party or any of its affiliates currently owns, has the right to enforce or will acquire or have the right to enforce within five (5) years following the date of the Settlement Agreement, including
the Litigation Patents (collectively, the Subject Patents), or (ii) challenging the validity or enforceability of any Subject Patent.

In addition to the Perpetual Covenant, the parties to the Settlement Agreement agreed, on behalf of themselves and their affiliates, for a period of three (3) years, not to file any patent infringement lawsuits
against any other party to the Settlement Agreement, their affiliates, or, subject to certain qualifications, any of their respective resellers, customers, OEM partners or suppliers. In addition, we and Quantum released each other from any and all
claims, demands, losses, liabilities and causes of action relating to the Patent Infringement Actions or any infringement of any patent based on acts occurring prior to the date of the Settlement Agreement.

From time to time, we are subject to various legal proceedings, claims and litigation arising in the ordinary course of business. We do not believe we
are party to any currently pending legal proceedings the outcome of which may have a material adverse effect on our financial position, results of operations or cash flows.

There can be no assurance that existing or future legal proceedings arising in the ordinary course of business or otherwise will not have a material
adverse effect on our financial position, results of operations or cash flows.



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|Item 1A. | Risk Factors
|-------- | ------------

Set forth below and elsewhere in
this Quarterly Report on Form 10-Q, and in other documents we file with the SEC, are risks and uncertainties that could cause actual results to differ materially from the results contemplated by the forward-looking statements contained in this
Quarterly Report on Form 10-Q. Because of the following factors, as well as other variables affecting our operating results, past financial performance should not be considered as a reliable indicator of future performance and investors should not
use historical trends to anticipate results or trends in future periods.

Risks Related to Our Business and Industry

Our operating results may fluctuate significantly, which makes our future results difficult to predict and could cause our operating results to fall below
expectations or our guidance.

Our quarterly and annual operating results have varied significantly in the past and could vary
significantly in the future, which makes it difficult for us to predict our future operating results. Our operating results may fluctuate due to a variety of factors, many of which are outside of our control, including the changing and recently
volatile U.S. and global economic environment, and any of which may cause our stock price to fluctuate. As a result, comparing our operating results on a period-to-period basis may not be meaningful. You should not rely on our past results as an
indication of our future performance. In addition, revenues in any quarter are largely dependent on customer contracts entered into during that quarter. Moreover, a significant portion of our quarterly sales typically occurs during the last month of
the quarter, which we believe reflects customer buying patterns of products similar to ours and other products in the technology industry generally. As a result, our quarterly operating results are difficult to predict even in the near term and a
delay in an anticipated sale past the end of a particular quarter may negatively impact our results of operations for that quarter, or in some cases, that year. A delay in the recognition of revenue, even from just one account, may have a
significant negative impact on our results of operations for a given period. If our revenue or operating results fall below the expectations of investors or securities analysts or below any guidance we may provide to the market, as occurred in the
quarter ended March 31, 2008, the price of our common stock could decline substantially. Such a stock price decline could occur, and has occurred in the past, even when we have met our publicly stated revenue and/or earnings guidance.

In addition to other risks listed in this Risk Factors section, factors that may affect our operating results include, but are
not limited to:



| |  |  | fluctuations in demand, including due to seasonality, for our products and services. For example, many companies in our industry experience adverse seasonal
fluctuations in customer spending patterns, particularly in the first and third quarters; we have experienced these seasonal fluctuations in the past and expect that this trend will continue in the future;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | fluctuations in sales cycles and prices for our products and services;
| | - |  | ----------------------------------------------------------------------



| |  |  | reductions in customers budgets for information technology purchases and delays in their purchasing cycles;
| | - |  | ------------------------------------------------------------------------------------------------------------



| |  |  | general economic conditions in our domestic and international markets;
| | - |  | ----------------------------------------------------------------------



| |  |  | limited visibility into customer spending plans;
| | - |  | ------------------------------------------------



| |  |  | changing market conditions, including current and potential customer consolidation;
| | - |  | -----------------------------------------------------------------------------------



| |  |  | customer concentration;
| | - |  | -----------------------



| |  |  | the timing of recognizing revenue in any given quarter as a result of software revenue recognition rules, including the extent to which sales transactions in a
given period are unrecognizable until a future period or, conversely, the satisfaction of revenue recognition rules in a given period resulting in the recognition of revenue from transactions initiated in prior periods;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the sale of our products in the timeframes we anticipate, including the number and size of orders, and the product mix within any such orders, in each quarter;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to develop, introduce and ship in a timely manner new products and product enhancements that meet customer requirements;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the timing and execution of product transitions or new product introductions, including any related or resulting inventory costs;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------



| |  |  | the timing of product releases or upgrades by us or by our competitors;
| | - |  | -----------------------------------------------------------------------



| |  |  | any significant changes in the competitive dynamics of our markets, including new entrants or substantial discounting of products;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to control costs, including our operating expenses and the costs of the components we purchase;
| | - |  | -----------------------------------------------------------------------------------------------------------



| |  |  | any spending charges in response to changes in the marketplace or perceived marketplace opportunities;
| | - |  | ------------------------------------------------------------------------------------------------------



| |  |  | our ability to derive benefits from our investments in sales, marketing, engineering or other activities;
| | - |  | ---------------------------------------------------------------------------------------------------------



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| |  |  | our ability to successfully work with partners on combined solutions. For example, where our product features the Riverbed Services Platform (RSP), we are required
to work closely with our partners in product validation, marketing, selling and support;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | volatility in our stock price, which may lead to higher stock compensation expenses pursuant to Statement of Financial Accounting Standards No. 123(R); and
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | unpredictable fluctuations in our effective tax rate due to disqualifying dispositions of stock from the employee stock purchase plan and stock options, changes in
the valuation of our deferred tax assets or liabilities, changes in actual results versus our estimates, or changes in tax laws, regulations, accounting principles, or interpretations thereof.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

We face intense competition that could reduce our revenue and adversely affect our financial results.

The market for our products is highly competitive and we expect competition to intensify in the future. Other companies may introduce new products in the
same markets we serve or intend to enter.

This competition could result in increased pricing pressure, reduced profit margins, increased
sales and marketing expenses and failure to increase, or the loss of, market share, any of which would likely seriously harm our business, operating results or financial condition.

Competitive products may in the future have better performance, more and/or better features, lower prices and broader acceptance than our products. Many
of our current or potential competitors have longer operating histories, greater name recognition, larger customer bases and significantly greater financial, technical, sales, marketing and other resources than we do. Potential customers may prefer
to purchase from their existing suppliers rather than a new supplier regardless of product performance or features. Currently, we face competition from a number of established companies, including Cisco Systems, Juniper Networks, Blue Coat Systems,
F5 Networks and Citrix Systems. We also face competition from a large number of smaller private companies and new market entrants.

We
expect increased competition from our current competitors as well as other established and emerging companies if our market continues to develop and expand. For example, third parties currently selling our products could market products and services
that compete with our products and services. In addition, some of our competitors have made acquisitions or entered into partnerships or other strategic relationships with one another to offer a more comprehensive solution than they individually had
offered. We expect this trend to continue as companies attempt to strengthen or maintain their market positions in an evolving industry and as companies enter into partnerships or are acquired. Many of the companies driving this consolidation trend
have significantly greater financial, technical and other resources than we do and are better positioned to acquire and offer complementary products and technologies. The companies resulting from these possible consolidations may create more
compelling product offerings and be able to offer greater pricing flexibility, making it more difficult for us to compete effectively, including on the basis of price, sales and marketing programs, technology or product functionality. Continued
industry consolidation may adversely impact customers perceptions of the viability of smaller and even medium-sized technology companies and consequently customers willingness to purchase from such companies. These pressures could
materially adversely affect our business, operating results and financial condition.

We also face competitive pressures from other
sources. For example, Microsoft has announced its intention to improve the performance of its software for remote office users. Our products are designed to improve the performance of many applications, including applications that are based on
Microsoft protocols. Accordingly, improvements to Microsoft application protocols may reduce the need for our products, adversely affecting our business, operating results and financial condition. Improvement in other application protocols or in the
Transmission Control Protocol (TCP), the underlying transport protocol for most WAN traffic, could have a similar effect. In addition, we market our products, in significant part, on the anticipated cost savings to be realized by organizations if
they are able to avoid the purchase of costly IT infrastructure at remote sites by purchasing our products. To the extent other companies are able to reduce the costs associated with purchasing and maintaining servers, storage or applications to be
operated at remote sites, our business, operating results and financial condition could be adversely affected.

Continued adverse economic conditions or
reduced information technology spending may harm our business. In addition, the recent turmoil in credit markets increases our exposure to our customers and partners credit risk, which could result in reduced revenue.

Our business depends on the overall demand for information technology, and in particular for Wide-area Data Services, and on the economic health and
general willingness of our current and prospective customers to make capital commitments. If the conditions in the U.S. and global economic environment remain uncertain or continue to be volatile, or if they deteriorate further, our business,
operating results, and financial condition may be materially adversely affected. In addition,



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the market we serve is emerging and the purchase of our products involves material changes to established purchasing patterns and policies. The purchase of
our products is often discretionary and may involve a significant commitment of capital and other resources. In addition, our operating expenses are largely based on anticipated revenue trends and a high percentage of our expenses are, and will
continue to be, fixed in the short-term. Uncertainty about future economic conditions makes it difficult to forecast operating results and to make decisions about future investments. Weak or volatile economic conditions, or a reduction in
information technology spending even if economic conditions improve, would likely harm our business and operating results in a number of ways, including longer sales cycles, lower prices for our products and services and reduced unit sales. In
addition, the increase in worldwide commodity prices in 2008 has resulted, and any future increase may result, in higher component prices and increased shipping costs, both of which may negatively impact our financial results.

Many of our customers and channel partners finance their purchases of our products. Any freeze, or reduced liquidity, in the credit markets, such as we
have recently experienced, may result in customers or channel partners either delaying or entirely foregoing planned purchases of our products as they are unable to obtain the required financing. This would result in reduced revenues, and our
business, operating results and financial condition would be harmed. In addition, these customers and partners ability to pay for products already purchased may be adversely affected by the credit market turmoil or an associated downturn
in their own business, which in turn could harm our business, operating results and financial condition.

We compete in rapidly evolving markets and
have a limited operating history, which make it difficult to predict our future operating results.

We were incorporated in May 2002 and
shipped our first Steelhead appliance in May 2004. We have a limited operating history and offer a focused line of products in an industry characterized by rapid technological change. It is very difficult to forecast our future operating results.
You should consider and evaluate our prospects in light of the risks and uncertainty frequently encountered by companies in rapidly evolving markets characterized by rapid technological change, changing customer needs, increasing competition,
evolving industry standards and frequent introductions of new products and services. As we encounter rapidly changing customer requirements and increasing competitive pressures, we likely will be required to reposition our product and service
offerings and introduce new products and services. We may not be successful in doing so in a timely and appropriately responsive manner, or at all. Furthermore, many of our target customers have not purchased products similar to ours and might not
have a specific budget for the purchase of our products and services. All of these factors make it difficult to predict our future operating results.

We rely heavily on indirect distribution partners to sell our products. Disruptions to, or our failure to effectively develop and manage, our distribution channels and the processes and procedures that support them could harm our
business.

Our future success is highly dependent upon establishing and maintaining successful relationships with a variety of indirect
distribution partners, including value-added resellers and service providers. A substantial majority of our revenue is derived through indirect channel sales and we expect indirect channel sales to continue to account for a substantial majority of
our total revenue. Accordingly, our revenue depends in large part on the effective performance of these channel partners, and the loss of or reduction in sales to our channel partners could materially reduce our revenues. By relying on indirect
channels, we may have little or no contact with the ultimate users of our products, thereby making it more difficult for us to establish brand awareness, ensure proper delivery and installation of our products, service ongoing customer requirements
and respond to evolving customer needs. In addition, we recognize a large portion of our revenue based on a sell-through model using information regarding the end user customers that is provided by our channel partners. If those channel partners
provide us with inaccurate or untimely information, the amount or timing of our revenues could be adversely impacted.

Recruiting and
retaining qualified channel partners and training them in our technology and product offerings requires significant time and resources. In order to develop and expand our distribution channel, we must continue to scale and improve our processes and
procedures that support our distribution channel, including investment in systems and training, and those processes and procedures may become increasingly complex and difficult to manage. We have no minimum purchase commitments with any of our
value-added resellers or other indirect distributors, and our contracts with these channel partners do not prohibit them from offering products or services that compete with ours. Our competitors may be effective in providing incentives to existing
and potential channel partners to favor their products, to choose not to partner with us, or to prevent or reduce sales of our products. Our channel partners may choose not to offer our products exclusively or at all. If we fail to maintain
successful relationships with our channel partners, fail to develop new relationships with channel partners in new markets or expand the number of channel partners in existing markets, fail to manage, train or motivate existing channel partners
effectively or if these channel partners are not successful in their sales efforts, sales of our products may decrease and our business, operating results and financial condition would be materially adversely affected.



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We expect our gross margins to vary over time and our recent level of product gross margin may not be sustainable. In
addition, our product gross margins may continue to be adversely affected by our recent and future introductions of new products.

Our
product gross margins vary from quarter to quarter and the recent level of gross margins may not be sustainable and may be adversely affected in the future by numerous factors, including but not limited to product or sales channel mix shifts,
increased price competition, increases in material or labor costs, excess product component or obsolescence charges from our contract manufacturers, write-downs for obsolete or excess inventory, increased costs due to changes in component pricing or
charges incurred due to component holding periods if our forecasts do not accurately anticipate product demand, warranty related issues, or our introduction of new products or new product platforms or entry into new markets with different pricing
and cost structures.

We recently introduced our 50 series of Steelhead appliances. The introduction of, and planned transition to, a new
product line requires us to forecast customer demand for both legacy and new product lines for a period of time, and to maintain adequate inventory levels to support the sales forecasts for both product lines. If new product line sales exceed our
sales forecast, we could possibly experience stock shortages, which would negatively affect our revenues. If legacy product line sales fall short of our sales forecast, we could have excess inventory. In the second and third fiscal quarters of 2008,
we recognized approximately $1.1 million and $3.3 million, respectively, in excess and obsolete inventory charges related to the new product line introduction. Our inventory level increased in our third fiscal quarter as we balanced the forecast
demand for both product lines. If future sales between our legacy and any new product lines differ from our forecasts, and this results in an excess of legacy products, then additional inventory charges may be required. In addition, if future
overall sales are less than forecasted, then additional inventory charges may be required. Any inventory charges would negatively impact our product gross margins.

We rely on third parties to perform shipping and other logistics functions on our behalf. A failure or disruption at a logistics partner would harm our business.

Currently, we use third-party logistics partners to perform storage, packaging, shipment and handling for us, including a logistics service provider that
began shipping European orders in the second quarter. Although the logistics services required by us may be readily available from a number of providers, it is time consuming and costly to qualify and implement these relationships. If one or more of
our logistics partners suffers an interruption in its business, or experiences delays, disruptions or quality control problems in its operations, or we choose to change or add additional logistics partners, our ability to ship products to our
customers would be delayed and our business, operating results and financial condition would be adversely affected.

We are susceptible to shortages or
price fluctuations in our supply chain. Any shortages or price fluctuations in components used in our products could delay shipment of our products or increase our costs and harm our operating results.

Our increase in the use of Riverbed-designed content in our hardware platforms has increased our susceptibility to scarcity or delivery delays for custom
components within our systems. Shortages in components that we use in our products are possible and our and our suppliers ability to predict the availability of such components may be limited. Some of these components are available only from
limited sources of supply. The unavailability of any of these components would prevent us from shipping products because each of these components is necessary to the proper functioning of our appliances. In addition, the lead times associated with
certain components are lengthy and preclude rapid changes in quantity requirements and delivery schedules.

Any growth in our business or
the economy is likely to create greater pressures on us and our suppliers to project overall component demand accurately and to establish optimal component inventory levels. In addition, increased demand by third parties for the components we use in
our products may lead to decreased availability and higher prices for those components. We carry limited inventory of our product components, and we rely on suppliers to deliver components in a timely manner based on forecasts we provide. We rely on
both purchase orders and long-term contracts with our suppliers, but we may not be able to secure sufficient components at reasonable prices or of acceptable quality, which would seriously impact our ability to deliver products to our customers, and
as a result adversely impact our revenue.

If we fail to accurately predict our manufacturing requirements, we could incur additional costs or
experience manufacturing delays, which would harm our business. We are dependent on contract manufacturers, and changes to those relationships, expected or unexpected, may result in delays or disruptions that could harm our business.

We depend on independent contract manufacturers to manufacture and assemble our products. We rely on purchase orders or long-term contracts with our
contract manufacturers. Some of our contract manufacturers are not obligated to supply products to us for any specific period, in any specific quantity or at any specific price. Our orders may represent a



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relatively small percentage of the overall orders received by our contract manufacturers from their customers. As a result, fulfilling our orders may not be
considered a priority by one or more of our contract manufacturers in the event the contract manufacturer is constrained in its ability to fulfill all of its customer obligations in a timely manner. We provide demand forecasts to our contract
manufacturers. If we overestimate our requirements, the contract manufacturers may assess charges or we may have liabilities for excess inventory, each of which could negatively affect our gross margins. Conversely, because lead times for required
materials and components vary significantly and depend on factors such as the specific supplier, contract terms and the demand for each component at a given time, if we underestimate our requirements, the contract manufacturers may have inadequate
materials and components required to produce our products, which could interrupt manufacturing of our products and result in delays in shipments and deferral or loss of revenue.

Although the contract manufacturing services required to manufacture and assemble our products may be readily available from a number of established
manufacturers, it is time consuming and costly to qualify and implement contract manufacturer relationships. Therefore, if one or more of our contract manufacturers suffers an interruption in its business, or experiences delays, disruptions or
quality control problems in its manufacturing operations, or we choose to change or add additional contract manufacturers, our ability to ship products to our customers would be delayed.

If we are unable to protect our intellectual property rights, our competitive position could be harmed or we could be required to incur significant expenses to enforce our rights.

We depend on our ability to protect our proprietary technology. We rely on trade secret, patent, copyright and trademark laws and confidentiality
agreements with employees and third parties, all of which offer only limited protection. Despite our efforts, the steps we have taken to protect our proprietary rights may not be adequate to preclude misappropriation of our proprietary information
or infringement of our intellectual property rights, and our ability to police such misappropriation or infringement is uncertain, particularly in countries outside of the United States. Further, with respect to patent rights, we do not know whether
any of our pending patent applications will result in the issuance of patents or whether the examination process will require us to narrow our claims, and even if patents are issued, they may be contested, circumvented or invalidated over the course
of our business. The invalidation of any of our key patents could benefit our competitors by allowing them to more easily design products similar to ours. Moreover, the rights granted under any issued patents may not provide us with proprietary
protection or competitive advantages, and competitors may in any event be able to develop similar or superior technologies to our own now or in the future. Protecting against the unauthorized use of our products, trademarks and other proprietary
rights is expensive, difficult and, in some cases, impossible. Litigation has been necessary in the past and may be necessary in the future to enforce or defend our intellectual property rights, to protect our trade secrets or to determine the
validity and scope of the proprietary rights of others. For example, we recently settled a patent infringement lawsuit with Quantum Corporation where both we and Quantum asserted that the other party infringed a patent or patents. Intellectual
property litigation has resulted and may in the future result in substantial costs and diversion of management resources, and may in the future harm our business, operating results and financial condition. Furthermore, many of our current and
potential competitors have the ability to dedicate substantially greater resources to enforce their intellectual property rights than we do. Accordingly, despite our efforts, we may not be able to prevent third parties from infringing upon or
misappropriating our intellectual property.

Claims by others that we infringe their proprietary technology could harm our business.

Our industry is characterized by the existence of a large number of patents and frequent claims and related litigation regarding patent and other
intellectual property rights. In the ordinary course of our business, we are involved in disputes and licensing discussions with others regarding their claimed proprietary rights and we cannot assure you that we will always successfully defend
ourselves against such claims. Third parties have claimed and may in the future claim that our products or technology infringe their proprietary rights. For example, we recently settled a patent infringement lawsuit with Quantum Corporation. We
expect that infringement claims may increase as the number of products and competitors in our market increases and overlaps occur. In addition, as we have gained greater visibility and market exposure as a public company, we face a higher risk of
being the subject of intellectual property infringement claims. Any claim of infringement by a third party, even those without merit, could cause us to incur substantial legal costs defending against the claim, and could distract our management from
our business. Furthermore, we could be subject to a judgment or voluntarily enter into a settlement, either of which could require us to pay substantial damages. A judgment or settlement could also include an injunction or other court order that
could prevent us from offering our products. In addition, we might elect or be required to seek a license for the use of third-party intellectual property, which may not be available on commercially reasonable terms or at all, or if available, the
payments under such license may harm our operating results and financial condition. Alternatively, we may be required to develop non-infringing technology, which could require significant effort and expense and may ultimately not be successful. Any
of these events could seriously harm our business, operating results and financial condition. Third parties may also assert infringement claims against our customers and channel partners. Any of these claims would require us to initiate or defend
potentially protracted and costly litigation on their behalf, regardless of the merits of these claims, because



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we generally indemnify our customers and channel partners from claims of infringement of proprietary rights of third parties. If any of these claims succeed,
or if we voluntarily enter into a settlement, we may be forced to pay damages on behalf of our customers or channel partners, which could have a material adverse effect on our business, operating results and financial condition.

Our sales cycles can be long and unpredictable, and our sales efforts require considerable time and expense. As a result, our revenue is difficult to predict and may
vary substantially from quarter to quarter.

The timing of our revenue is difficult to predict. Our sales efforts involve educating our
customers about the use and benefit of our products, including their technical capabilities and potential cost savings to an organization. Customers typically undertake a significant evaluation process that has in the past resulted in a lengthy
sales cycle, in some cases over twelve months. Also, as our channel model distribution strategy evolves, utilizing value-added resellers, distributors, systems integrators and service providers, the level of variability in the length of sales cycle
across transactions may increase and make it more difficult to predict the timing of many of our sales transactions. We spend substantial time, effort and money in our sales efforts without any assurance that our efforts will produce any sales. In
addition, product purchases are frequently subject to budget constraints, multiple approvals, and unplanned administrative, processing and other delays. Beginning earlier in 2008, product purchases have been delayed by the volatile U.S. and global
economic environment, which has introduced additional risk into our ability to accurately forecast sales in a particular quarter. If sales expected from a specific customer for a particular quarter are not realized in that quarter or at all, revenue
will be harmed and we may miss our stated guidance for that period.

Our international sales and operations subject us to additional risks that may harm
our operating results.

In the year ended December 31, 2007, and in the nine months ended September 30, 2008, we derived
approximately 37% and 41%, respectively, of our revenue from customers outside the United States. We have personnel in numerous countries worldwide. We expect to continue to add personnel in additional countries. Our international sales and
operations subject us to a variety of risks, including:



| |  |  | the difficulty and cost of managing and staffing international offices and the increased travel, infrastructure, legal and other compliance costs associated with
multiple international locations;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | difficulties in enforcing contracts and collecting accounts receivable, and longer payment cycles, especially in emerging markets;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------



| |  |  | tariffs and trade barriers and other regulatory or contractual limitations on our ability to sell or develop our products in certain foreign markets;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | increased exposure to foreign currency exchange rate risk; and
| | - |  | --------------------------------------------------------------



| |  |  | reduced protection for intellectual property rights in some countries.
| | - |  | ----------------------------------------------------------------------

Recently, certain foreign currencies have experienced rapid fluctuations in value against the U.S. dollar. Any foreign currency devaluation against the
U.S. dollar would increase the real cost of our products to our customers and partners in foreign markets where we sell in U.S. dollars, which may result in delayed or cancelled purchases of our products and as a result adversely impact our
revenues. In addition, this increase in cost increases the risk to us that we will be unable to collect amounts owed to us by such customers or partners, which in turn would impact our revenues and could materially adversely impact our business and
financial results. Any devaluation may also lead us to more aggressively discount our prices in foreign markets in order to maintain competitive pricing, which would negatively impact our revenues and gross margins.

International customers may also require that we localize our products. The product development costs for localizing the user interface of our products,
both graphical and textual, could be a material expense to us if the software requires extensive modifications. To date, such changes have not been extensive and the costs have not been material.

As we continue to expand our business globally, our success will depend, in large part, on our ability to anticipate and effectively manage these and
other risks associated with our international sales and operations. Our failure to manage any of these risks successfully could harm our international operations, reduce our international sales and harm our business, operating results and financial
condition.

We are investing in engineering, sales, marketing, services and infrastructure, and these investments may achieve delayed or lower than
expected benefits, which could harm our operating results.

We intend to continue to add personnel and other resources to our
engineering, sales, marketing, services and infrastructure functions as we focus on developing new technologies, growing our market segment, capitalizing on existing or new market opportunities, increasing our market share, and enabling our business
operations to meet anticipated demand. We



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are likely to recognize the costs associated with these investments earlier than some of the anticipated benefits, and the return on these investments may be
lower, or may develop more slowly, than we expect. If we do not achieve the benefits anticipated from these investments, or if the achievement of these benefits is delayed, our operating results may be adversely affected.

If we lose key personnel or are unable to attract and retain personnel on a cost-effective basis, our business would be harmed.

Our success is substantially dependent upon the performance of our senior management and key technical and sales personnel. Our management and employees
can terminate their employment at any time, and the loss of the services of one or more of our executive officers or other key employees could harm our business. Our success also is substantially dependent upon our ability to attract additional
personnel for all areas of our organization, particularly in our sales, research and development and customer service departments. Competition for qualified personnel is intense, and we may not be successful in attracting and retaining such
personnel on a timely basis, on competitive terms, or at all. Additionally, fluctuations or a sustained decrease in the price of our stock could affect our ability to attract and retain key personnel. If we are unable to attract and retain the
necessary technical, sales and other personnel on a cost-effective basis, our business, operating results and financial condition would be adversely affected.

We may not generate positive returns on our research and development investments.

Developing our products is expensive, and
the investment in product development may involve a long payback cycle or may not generate additional revenue at all. In the nine months ended September 30, 2008, our research and development expenses were $43.3 million, or approximately 18% of
our total revenue. Our future plans include significant investments in research and development and related product opportunities. We believe that we must continue to dedicate a significant amount of resources to our research and development efforts
to maintain our competitive position. These investments may take several years to generate positive returns, if ever.

Our ability to sell our products
is highly dependent on the quality of our support and services offerings, and our failure to offer high quality support and services would harm our operating results and reputation.

Once our products are deployed within our customers networks, our customers depend on our support organization to resolve any issues relating to our
products. A high level of support is critical for the successful marketing and sale of our products. If we or our channel partners do not effectively assist our customers in deploying our products, succeed in helping our customers quickly resolve
post-deployment issues, and provide effective ongoing support, it would adversely affect our ability to sell our products to existing customers and would harm our reputation with potential customers. In addition, as we expand our operations
internationally, our support organization will face additional challenges, including those associated with delivering support, training and documentation in languages other than English. As a result, our failure to maintain high quality support and
services would harm our operating results and reputation.

If we fail to manage future growth effectively, our business would be harmed.

We have expanded our operations significantly since inception and anticipate that further significant expansion will be required. This future growth,
if it occurs, will place significant demands on our management, infrastructure and other resources. To manage any future growth, we will need to hire, integrate and retain highly skilled and motivated employees. We will also need to continue to
improve our financial and management controls, reporting systems and procedures. We have an enterprise resource planning software system that supports our finance, sales and inventory management processes. If we were to encounter delays or
difficulties as a result of this system, including loss of data and decreases in productivity, our ability to properly run our business could be adversely impacted. If we do not effectively manage our growth, our business would be harmed.

If we do not successfully anticipate market needs and develop products and product enhancements that meet those needs, or if those products do not gain
market acceptance, our business and operating results will be harmed.

We may not be able to anticipate future market needs or be able
to develop new products or product enhancements to meet such needs, either on a timely basis or at all. For example, our failure to address additional application-specific protocols, particularly if our competitors are able to provide such
functionality, could harm our business. In addition, our inability to diversify beyond our current product offerings could adversely affect our business. Any new products or product enhancements that we introduce may not achieve any significant
degree of market acceptance or be accepted into our sales channel by our channel partners, which would adversely affect our business and operating results.



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Organizations are increasingly concerned with the security of their data, and to the extent they elect to encrypt data
being transmitted from the point of the end user in a format that were not able to decrypt, rather than only across the WAN, our products will become less effective.

Our products are designed to remove the redundancy associated with repeated data requests over a WAN, either through a private network or a virtual
private network (VPN). The ability of our products to reduce such redundancy depends on our products ability to recognize the data being requested. Our products currently detect and decrypt some forms of encrypted data. Since most
organizations currently encrypt most of their data transmissions only between sites and not on the LAN, the data is not encrypted when it passes through our products. For those organizations that elect to encrypt their data transmissions from the
end-user to the server in a format that were not able to decrypt, our products will offer limited performance improvement unless we are successful in incorporating additional functionality into our products that address those encrypted
transmissions. Our failure to provide such additional functionality could limit the growth of our business and harm our operating results.

If our
products do not interoperate with our customers infrastructure, installations could be delayed or cancelled, which would harm our business.

Our products must interoperate with our customers existing infrastructure, which often have different specifications, utilize multiple protocol standards, deploy products from multiple vendors, and contain
multiple generations of products that have been added over time. If we find errors in the existing software or defects in the hardware used in our customers infrastructure or problematic network configurations or settings, as we have in the
past, we may have to modify our software or hardware so that our products will interoperate with our customers infrastructure. Our products may be unable to provide significant performance improvements for applications deployed in our
customers infrastructure. These issues could cause longer installation times for our products and could cause order cancellations, either of which would adversely affect our business, operating results and financial condition. In addition,
government and other customers may require our products to comply with certain security or other certifications and standards. If our products are late in achieving or fail to achieve compliance with these certifications and standards, or our
competitors achieve compliance with these certifications and standards, we may be disqualified from selling our products to such customers, or at a competitive disadvantage, which would harm our business, operating results and financial condition.

If functionality similar to that offered by our products is incorporated into existing network infrastructure products, organizations may decide
against adding our products to their network, which would harm our business.

Other providers of network infrastructure products are
offering or announcing functionality aimed at addressing the problems addressed by our products. For example, Cisco Systems incorporates WAN optimization functionality into certain of its router blades. The inclusion of, or the announcement of
intent to include, functionality perceived to be similar to that offered by our products in products that are already generally accepted as necessary components of network architecture or in products that are sold by more established vendors may
have an adverse effect on our ability to market and sell our products. Furthermore, even if the functionality offered by other network infrastructure providers is more limited than our products, a significant number of customers may elect to accept
such limited functionality in lieu of adding appliances from an additional vendor. Many organizations have invested substantial personnel and financial resources to design and operate their networks and have established deep relationships with other
providers of network infrastructure products, which may make them reluctant to add new components to their networks, particularly from new vendors. In addition, an organizations existing vendors or new vendors with a broad product offering may
be able to offer concessions that we are not able to match because we currently offer a focused line of products and have fewer resources than many of our competitors. If organizations are reluctant to add network infrastructure products from new
vendors or otherwise decide to work with their existing vendors, our business, operating results and financial condition will be adversely affected.

Our products are highly technical and may contain undetected software or hardware errors, which could cause harm to our reputation and our business.

Our products, including software product upgrades and releases, are highly technical and complex and, when deployed, are critical to the operation of many networks. Our products have contained and may contain
undetected errors, defects or security vulnerabilities. In particular, new products and product platforms may be subject to increased risk of hardware issues. Some errors in our products may only be discovered after a product has been installed and
used by customers. Some of these errors may be attributable to third-party technologies incorporated into our products, which makes us dependent upon the cooperation and expertise of such third parties for the diagnosis and correction of such
errors. The diagnosis and correction of third-party technology errors is particularly difficult where our product features the Riverbed Services Platform (RSP), because it is not always immediately clear whether a particular error is attributable to
a technology incorporated into our product or to the third-party RSP software deployed on our product. In addition, our RSP solutions, because they involve a third party, are more complex, and the solutions may lead to new technical errors that may
prove difficult to diagnose and



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support. Any delay or mistake in the initial diagnosis of an error will result in a delay in the formulation of an effective action plan to correct such
error. Any errors, defects or security vulnerabilities discovered in our products after commercial release could result in loss of revenue or delay in revenue recognition, loss of customers and increased service and warranty cost, any of which could
harm our reputation, business, operating results and financial condition. Any such errors, defects or security vulnerabilities could also adversely affect the markets perception of our products and business. In addition, we could face claims
for product liability, tort or breach of warranty, including claims relating to changes to our products made by our channel partners. Our contracts with customers contain provisions relating to warranty disclaimers and liability limitations, which
may not be upheld. Defending a lawsuit, regardless of its merit, is costly and may divert managements attention and harm the markets perception of us and our products. In addition, if our business liability insurance coverage proves
inadequate or future coverage is unavailable on acceptable terms or at all, our business, operating results and financial condition could be adversely impacted.

We may engage in future acquisitions that could disrupt our business and cause dilution to our stockholders.

In the future
we may acquire other businesses, products or technologies. We have not made any acquisitions to date. Our ability as an organization to make acquisitions is unproven. We may not be able to find suitable acquisition candidates and we may not be able
to complete acquisitions on favorable terms, if at all. If we do complete acquisitions, we may not ultimately strengthen our competitive position or achieve our goals, or the acquisition may be viewed negatively by customers, financial markets or
investors. In addition, with respect to any acquisitions that we make, we may encounter difficulties in integrating personnel and operations from the acquired businesses and in retaining and motivating key personnel from these businesses.
Acquisitions may disrupt our ongoing operations, divert management from day-to-day responsibilities and increase our expenses. Future acquisitions may reduce our cash available for operations and other uses and could result in an increase in
amortization expense related to identifiable assets acquired, potentially dilutive issuances of equity securities or the incurrence of debt.

Our use of
open source and third-party software could impose limitations on our ability to commercialize our products.

We incorporate open source
software into our products. Although we monitor our use of open source closely, the terms of many open source licenses have not been interpreted by United States courts, and there is a risk that such licenses could be construed in a manner that
could impose unanticipated conditions or restrictions on our ability to commercialize our products. In such event, we could be required to seek licenses from third parties in order to continue offering our products, to re-engineer our products or to
discontinue the sale of our products in the event re-engineering cannot be accomplished on a timely basis, any of which could adversely affect our business, operating results and financial condition.

We also incorporate certain third-party technologies, including software programs, into our products and may need to utilize additional third-party
technologies in the future. However, licenses to relevant third-party technology may not continue to be available to us on commercially reasonable terms, or at all. Therefore, we could face delays in product releases until equivalent technology can
be identified, licensed or developed, and integrated into our current products. These delays, if they occur, could materially adversely affect our business, operating results and financial condition. We currently use third-party software programs in
our Steelhead appliances, our Interceptor appliances, our Central Management Console appliances and our Steelhead Mobile software client and controller. For example, in our Steelhead appliances, we use third-party software to configure a storage
adapter for specific redundant disk setups as well as to initialize and diagnose hardware on certain models, and in our Central Management Console and Steelhead Mobile Controller appliances we use third-party software to help manage statistics and
reporting. Each of these software programs is currently available from only one vendor. As a result, any disruption in our access to these software programs could result in significant delays in our product releases and could require substantial
effort to locate or develop a replacement program. If we decide in the future to incorporate into our products any other software program licensed from a third party, and the use of such software program is necessary for the proper operation of our
appliances, then our loss of any such license would similarly adversely affect our ability to release our products in a timely fashion.

We are subject
to various regulations that could subject us to liability or impair our ability to sell our products.

Our products are subject to a
variety of government regulations, including export controls, import controls, environmental laws and required certifications. In particular, our products are subject to U.S. export controls and may be exported outside the U.S. only with the
required level of export license or through an export license exception, because we incorporate encryption technology into our products. In addition, various countries regulate the import of certain encryption technology and have enacted laws that
could limit our ability to distribute our products or could limit our customers ability to implement our products in those countries. Changes in our products or changes in regulations may create delays in the introduction of our products in
international markets, prevent our customers with international operations from deploying our products throughout their global systems or, in some cases, prevent the export or import of our products to certain countries



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altogether. Any change in regulations, shift in approach to the enforcement or scope of existing regulations, or change in the countries, persons or
technologies targeted by such regulations, could result in decreased use of our products by, or in our decreased ability to export or sell our products to, existing or potential customers with international operations. We must comply with various
and increasing environmental regulations, both domestic and international, regarding the manufacturing and disposal of our products. For example, we must comply with Waste Electrical and Electronic Equipment Directive laws, which are being adopted
by certain European Economic Area countries on a country-by-country basis. Failure to comply with these and similar laws on a timely basis, or at all, could have a material adverse effect on our business, operating results and financial condition.
This would also be true if we fail to comply, either on a timely basis or at all, with any U.S. environmental laws regarding the manufacturing or disposal of our products. Any decreased use of our products or limitation on our ability to export or
sell our products would harm our business, operating results and financial condition.

We incur significant costs as a result of operating as a public
company, and our management devotes substantial time to new compliance initiatives.

We incur significant legal, accounting and other
expenses as a public company, including costs resulting from regulations regarding corporate governance practices and costs relating to compliance with Section 404 of the Sarbanes-Oxley Act. For example, the listing requirements of the Nasdaq
Stock Markets Global Select Market require that we satisfy certain corporate governance requirements relating to independent directors, audit committees, distribution of annual and interim reports, stockholder meetings, stockholder approvals,
solicitation of proxies, conflicts of interest, stockholder voting rights and codes of conduct. Our management and other personnel devote a substantial amount of time to these compliance initiatives. Moreover, these rules and regulations have
increased our legal and financial compliance costs and will make some activities more time-consuming and costly. For example, these rules and regulations could make it more difficult for us to attract and retain qualified persons to serve on our
Board of Directors, our board committees or as executive officers.

While we believe that we currently have adequate internal control over financial
reporting, we are exposed to risks from legislation requiring companies to evaluate those internal controls.

The Sarbanes-Oxley Act
requires that we test our internal control over financial reporting and disclosure controls and procedures. In particular, for the year ended December 31, 2007, we performed system and process evaluation and testing of our internal control over
financial reporting to allow management and our independent registered public accounting firm to report on the effectiveness of our internal control over financial reporting, as required by Section 404 of the Sarbanes-Oxley Act. Our compliance
with Section 404 will require that we incur substantial expense and expend significant management time on compliance-related issues. Moreover, if we are not able to comply with the requirements of Section 404 in the future, or if we or our
independent registered public accounting firm identify deficiencies in our internal control over financial reporting that are deemed to be material weaknesses, the market price of our stock may decline and we could be subject to sanctions or
investigations by the Nasdaq Stock Markets Global Select Market, the SEC or other regulatory authorities, which would require significant additional financial and management resources.

We are required to expense equity compensation given to our employees, which has reduced our reported earnings, will harm our operating results in future periods and
may reduce our stock price and our ability to effectively utilize equity compensation to attract and retain employees.

We historically
have used stock options, RSUs, and an employee stock purchase plan as a significant component of our employee compensation program in order to align employees interests with the interests of our stockholders, encourage employee retention, and
provide competitive compensation packages. The Financial Accounting Standards Board has adopted changes that require companies to record a charge to earnings for employee stock option grants and other equity incentives. We adopted this standard
effective January 1, 2006. By causing us to record significantly increased compensation costs, such accounting changes have reduced, and will continue to reduce, our reported earnings, will harm our operating results in future periods, and may
require us to reduce the availability and amount of equity incentives provided to employees, which could make it more difficult for us to attract, retain and motivate key personnel. Moreover, if securities analysts, institutional investors and other
investors adopt financial models that include stock option expense in their primary analysis of our financial results, our stock price could decline as a result of reliance on these models with higher expense calculations.

If we need additional capital in the future, it may not be available to us on favorable terms, or at all.

We have historically relied on outside financing and cash flow from operations to fund our operations, capital expenditures and expansion. We may require
additional capital from equity or debt financing in the future to fund our operations or respond to competitive pressures or strategic opportunities. We may not be able to secure timely additional financing on favorable terms, or at all. The terms
of any additional financing may place limits on our financial and operating flexibility. If we raise additional funds through further issuances of equity, convertible debt securities or other securities



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convertible into equity, our existing stockholders could suffer significant dilution in their percentage ownership of our company, and any new securities we
issue could have rights, preferences and privileges senior to those of holders of our common stock. If we are unable to obtain adequate financing or financing on terms satisfactory to us, if and when we require it, our ability to grow or support our
business and to respond to business challenges could be significantly limited.

Our business is subject to the risks of earthquakes, fire, floods,
pandemics and other natural catastrophic events, and to interruption by manmade problems such as computer viruses or terrorism.

Our
main operations, including our primary data centers, are located in the San Francisco Bay Area, a region known for seismic activity. A significant natural disaster, such as an earthquake, fire or a flood, could harm our business, operating results
and financial condition. In addition, our servers are vulnerable to computer viruses, break-ins and similar disruptions from unauthorized tampering with our computer systems. Acts of terrorism or war could also cause disruptions in our or our
customers business or the economy as a whole. To the extent that such disruptions result in delays or cancellations of customer orders or the deployment of our products, our business, operating results and financial condition would be
adversely affected.

Risks Related to Ownership of Our Common Stock

The trading price of our common stock has been volatile and is likely to be volatile in the future.

The trading prices of the securities of technology companies have been highly volatile. Further, our common stock has a limited trading history. Since our initial public offering in September 2006 through September 30, 2008, our stock
price has fluctuated from a low of $10.40 to a high of $52.81. Factors that could affect the trading price of our common stock include, but are not limited to:



| |  |  | variations in our operating results;
| | - |  | ------------------------------------



| |  |  | announcements of technological innovations, new services or service enhancements, strategic alliances or significant agreements by us or by our competitors;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the gain or loss of significant customers;
| | - |  | ------------------------------------------



| |  |  | recruitment or departure of key personnel;
| | - |  | ------------------------------------------



| |  |  | changes in the estimates of our operating results, either by us or by any securities analysts who follow our common stock, or changes in recommendations by any
securities analysts who follow our common stock;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | significant sales or purchases, or announcement of significant sales or purchases, of our common stock by us or our stockholders, including our directors and
executive officers;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | announcements by or about us regarding events or news adverse to our business;
| | - |  | ------------------------------------------------------------------------------



| |  |  | market conditions in our industry, the industries of our customers and the economy as a whole;
| | - |  | ----------------------------------------------------------------------------------------------



| |  |  | adoption or modification of regulations, policies, procedures or programs applicable to our business; and
| | - |  | ---------------------------------------------------------------------------------------------------------



| |  |  | an announced acquisition of a competitor or us.
| | - |  | -----------------------------------------------

If the market for technology stocks or the stock market in general experiences loss of investor confidence, the trading price of our common stock could decline for reasons unrelated to our business, operating results
or financial condition. The trading price of our common stock might also decline in reaction to events that affect other companies in our industry or the stock market generally even if these events do not directly affect us. Each of these factors,
among others, could cause our stock price to decline. Some companies that have had volatile market prices for their securities have had securities class actions filed against them. If a suit were filed against us, regardless of its merits or
outcome, it could result in substantial costs and divert managements attention and resources.

If securities or industry analysts do not publish
research or publish inaccurate or unfavorable research about our business, our stock price and trading volume could decline.

The
trading market for our common stock will continue to depend in part on the research and reports that securities or industry analysts publish about us or our business. If we do not continue to maintain adequate research coverage or if one or more of
the analysts who covers us downgrades our stock or publishes inaccurate or unfavorable research about our business, our stock price would likely decline. If one or more of these analysts ceases coverage of our company or fails to publish reports on
us regularly, demand for our stock could decrease, which could cause our stock price and trading volume to decline.



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Insiders have substantial control over us and will be able to influence corporate matters.

As of September 30, 2008, our directors and executive officers and their affiliates beneficially owned, in the aggregate, approximately 20.3% of our
outstanding common stock. As a result, these stockholders will be able to exercise significant influence over all matters requiring stockholder approval, including the election of directors and approval of significant corporate transactions, such as
a merger or other sale of our company or its assets. This concentration of ownership could limit your ability to influence corporate matters and may have the effect of delaying or preventing a third party from acquiring control over us.

Anti-takeover provisions in our charter documents and Delaware law could discourage, delay or prevent a change in control of our company and may affect the trading
price of our common stock.

We are a Delaware corporation and the anti-takeover provisions of the Delaware General Corporation Law may
discourage, delay or prevent a change in control by prohibiting us from engaging in a business combination with an interested stockholder for a period of three years after the person becomes an interested stockholder, even if a change in control
would be beneficial to our existing stockholders. In addition, our restated certificate of incorporation and amended and restated bylaws contain provisions that may discourage, delay or prevent a change in our management or control over us that
stockholders may consider favorable.



|Item 2. | Unregistered Sales of Equity Securities and Use of Proceeds
|------- | -----------------------------------------------------------

The following table summarizes the stock repurchase activity for the three months ended September 30, 2008 and the approximate dollar value of shares that may yet be purchased pursuant to our stock repurchase program:



|                                       |  |                                    |  |                            |       |                                                                   |         |                                                                                        |   |           
|-------------------------------------- |  | ---------------------------------- |  | -------------------------- | ----- | ----------------------------------------------------------------- | ------- | -------------------------------------------------------------------------------------- | - | ----------
|Period                                 |  | Total Number ofSharesPurchased (1) |  | AveragePrice Paidper Share |       | Total Number ofShares Purchasedas Part ofPubliclyAnnouncedProgram |         | MaximumApproximate DollarValue of Shares
thatMay Yet be PurchasedUnder the Program (2)
|July 1, 2008  July 31, 2008           |  | 70,700                             |  | $                          | 16.09 |                                                                   | 70,700  |                                                                                        | $ | 86,395,000
|August 1, 2008  August 31, 2008       |  | 471,256                            |  |                            | 16.89 |                                                                   | 471,256 |                                                                                        |   | 78,434,000
|September 1, 2008  September 30, 2008 |  | 211,900                            |  |                            | 16.09 |                                                                   | 211,900 |                                                                                        |   | 75,023,000
|                                       |  |                                    |  |                            |       |                                                                   |         |                                                                                        |   |           
|Total                                  |  | 753,856                            |  | $                          | 16.59 |                                                                   | 753,856 |                                                                                        | $ | 75,023,000
|                                       |  |                                    |  |                            |       |                                                                   |         |                                                                                        |   |           



|(1) | On April 21, 2008, our Board of Directors authorized a Share Repurchase Program, which authorizes us to repurchase up to $100 million of our outstanding common stock during a
period not to exceed 24 months from the Board authorization date.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(2) | During the third quarter of 2008, we repurchased 753,856 shares of common stock under this Program for an aggregate purchase price of approximately $12.5 million, or an average of
$16.59 per share. These shares were purchased in open market transactions. The timing and amounts of these purchases were based on market conditions and other factors including price, regulatory requirements and capital availability. The share
repurchases were financed by available cash balances and cash from operations.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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|Item 6. | Exhibits
|------- | --------



|            |  |                                                                                                                                                                               
|----------- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit No. |  | Description                                                                                                                                                                   
|            | 
|3.2         |  | Restated Certificate of Incorporation. (1)                                                                                                                                    
|            | 
|3.4         |  | Amended and Restated Bylaws. (1)                                                                                                                                              
|            | 
|4.2         |  | Form of Common Stock Certificate. (1)                                                                                                                                         
|            | 
|31.1        |  | Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                                           
|            | 
|31.2        |  | Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                                           
|            | 
|32.1        |  | Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of
2002.

The certification attached as Exhibit 32 that accompanies this Quarterly Report on Form 10-Q is
not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of Riverbed Technology, Inc. under the Securities Act of 1933 or the Securities Exchange Act of 1934, whether made before or
after the date of this Quarterly Report on Form 10-Q, irrespective of any general incorporation language contained in such filing.



|(1) | Incorporated by reference to exhibit of same number filed with the Registrants Registration Statement on Form S-1 (No. 333-133437) on April 20, 2006, as amended.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------



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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Dated: October 30, 2008



RIVERBED TECHNOLOGY, INC.By:

/s/ Jerry M. KennellyJerry M. KennellyPresident and Chief Executive Officer


Dated: October 30, 2008



RIVERBED TECHNOLOGY, INC.By:

/s/ Randy S. GottfriedRandy S. GottfriedChief Financial Officer




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EXHIBIT INDEX



|            |  |                                                                                                                                                                               
|----------- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit No. |  | Description                                                                                                                                                                   
|            | 
|3.2         |  | Restated Certificate of Incorporation. (1)                                                                                                                                    
|            | 
|3.4         |  | Amended and Restated Bylaws. (1)                                                                                                                                              
|            | 
|4.2         |  | Form of Common Stock Certificate. (1)                                                                                                                                         
|            | 
|31.1        |  | Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                                           
|            | 
|31.2        |  | Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                                           
|            | 
|32.1        |  | Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

The certification attached as Exhibit 32 that accompanies this Quarterly Report on Form 10-Q is
not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of Riverbed Technology, Inc. under the Securities Act of 1933 or the Securities Exchange Act of 1934, whether made before or
after the date of this Quarterly Report on Form 10-Q, irrespective of any general incorporation language contained in such filing.



|(1) | Incorporated by reference to exhibit of same number filed with the Registrants Registration Statement on Form S-1 (No. 333-133437) on April 20, 2006, as amended.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------



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