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|  þ | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |
|--------------|--------------------------------------------------------------------------------------|
|         | For the fiscal year ended December 31, 2009.                                         |
|         |                                                                                 |

|   | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 (No Fee Required) |
|----------------|------------------------------------------------------------------------------------------------------------|

|                                                          |   |                             |
|---------------------------------------------------------------|--------|----------------------------------|
| Delaware                                                      |   | 74-3016523                       |
| (State or Other Jurisdiction ofIncorporation or Organization) |   | (IRS EmployerIdentification No.) |

|                                                    |   Securities registered pursuant to Section 12(b) of the Act: |                                      |
|---------------------------------------------------------|--------------------------------------------------------------------|-------------------------------------------|
| Title of each class       |                                                               | Name of each exchange of which registered |
| Common Stock, par value $0.001 per share      |                                                               | New York Stock Exchange                   |

|  Securities registered pursuant to Section 12(g) of the Act: |
|-------------------------------------------------------------------|
|  None                                                        |
|  (Title of Class)                                            |

|                           |   |                       |   |                           |   |                               |
|--------------------------------|--------|----------------------------|--------|--------------------------------|--------|------------------------------------|
| Large accelerated filer þ |   | Accelerated filer  |   | Non-accelerated filer  |   | Smaller reporting company  |

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| (a)   | Financial Statements |
|-----------------|----------------------|

|            (b)   | Exhibits – See Index to Exhibits at the end of this report, which contains a list of exhibits which are incorporated by reference, as indicated, into this Report. |
|------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | (c)   | Financial Statement Schedules |
|--------|-----------------|-------------------------------|

|                                                                                   |   | Beginning Balance |   |   | Additions Charged to Net Revenues, and Costs and Expenses |   |   | Write-offs |   |   | Ending Balance |   |
|----------------------------------------------------------------------------------------|--------|-------------------|--------|--------|-----------------------------------------------------------|--------|--------|------------|--------|--------|----------------|--------|
| Allowance for doubtful accounts and customer credits for the years ending December 31: |   |              |   |   |                                                      |   |   |       |   |
|  2007                                                                             |   | $                 | 2,037  |   |                                                      | $      | 9,794  |       |   | $      | (8,990         | )      |   | $ | 2,841 |   |
|  2008                                                                             |   | $                 | 2,841  |   |                                                      | $      | 6,465  |       |   | $      | (6,011         | )      |   | $ | 3,295 |   |
|  2009                                                                             |   | $                 | 3,295  |   |                                                      | $      | 13,364 |       |   | $      | (12,361        | )      |   | $ | 4,298 |   |

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| INDEX TO EXHIBITS |
|-------------------|
|              |   |   |
| Exhibits          |   | Description |
|              |   |   |
|   3.1   |   | Certificate of Incorporation of the Registrant (2) |
|   3.3   |   | Amended and Restated Bylaws of the Registrant (3) |
|   4.1   |   | Form of Common Stock Certificate of the Registrant (3) |
|   4.2   |   | Founder’s Registration Rights Agreement dated October 1, 2002 among the Registrant and certain stockholders (1) |
|   4.3   |   | Investor’s Registration Rights Agreement dated October 1, 2002 among the Registrant and certain stockholders (1) |
| 10.1              |   | Form of Indemnification Agreement for directors and officers (2) |
| 10.2              |   | 1999 Assumed Stock Option Plan and form of agreement thereunder (1) |
| 10.3              |   | 2003 Stock Option Plan and form of agreement thereunder (1) |
| 10.4              |   | 2005 Non-Qualified Stock Option Plan and form of agreement thereunder (1) |
| 10.5              |   | Form of Share Option Agreement (U.K.) (4) |
| 10.6 (A)     |   | Amended and Restated 2007 Long-Term Incentive Plan and form of agreement thereunder (2) |
| 10.6 (B)     |   | Certificate of Amendment to Amended and Restated 2007 Long-Term Incentive Plan (2) |
| 10.6 (C)     |   | Form of RSU Agreement Under 2007 Long Term Incentive Plan (Time Based) |
| 10.6 (D)     |   | Form of RSU Agreement Under 2007 Long Term Incentive Plan (Performance Based) |
| 10.7              |   | Webmail.us, Inc. 2004 Stock Incentive Plan, as amended in 2006 (1) |
| 10.8              |   | 2008 Employee Stock Purchase Plan and form of agreement thereunder (2) |
| 10.9              |   | Rackspace US, Inc. Deferred Compensation Plan (3) |
| 10.10             |   | Office Building Lease dated March 16, 2004 between Data Rose Limited Partnership and Rackspace Headquarters, LLC, as amended on April 26, 2004, June 1, 2006, and April 17, 2008 (1) |
| 10.11             |   | Ground Lease Agreement dated August 2, 2007, between Windcrest Economic Development Corporation and Rackspace US, Inc., as amended on April 24, 2008 (1) |
| 10.12             |   | Walzem Road Redevelopment Project Master Economic Incentives Agreement among the City of Windcrest, Texas, the City of San Antonio, Texas, the County of Bexar, Texas, the Windcrest Economic Development Corporation, the Windcrest Economic Development Company, LLC, and Rackspace US, Inc. dated August 2, 2007 (1) |
| 10.13             |   | City Economic Development Grant Agreement between the City of Windcrest, Texas and Rackspace US, Inc. dated August 2, 2007 (1) |
| 10.14             |   | County Economic Development Grant Agreement between Bexar County, Texas and Rackspace US, Inc. dated August 2, 2007 (1) |
| 10.15             |   | Developer Economic Development Grant Agreement among the City of Windcrest, Texas, the Windcrest Economic Development Corporation, and Windcrest Economic Development Company, LLC dated August 2, 2007 (1) |
| 10.16             |   | Economic Development Agreement between the State of Texas and Rackspace US, Inc. dated August 1, 2007 (1) |
| 10.17             |   | Office Building Lease Agreement dated February 22, 2000 between Santa Clara Land Company, Ltd. and the Registrant, as amended on March 30, 2000, December 9, 2004, and March 1, 2007 (1) |
| 10.18             |   | Storage Lease effective March 1, 2004 between Santa Clara Land Company, Ltd. and the Registrant (2) |
| 10.19 (A)    |   | Lease Agreement dated January 28, 2008 between Santa Clara Land Company, Ltd. and Rackspace US, Inc. (1) |
| 10.19 (B)    |   | First Amendment to Office Building Lease Agreement between Santa Clara Land Company, Ltd. and Rackspace US, Inc., dated July 10, 2008 (3) |
| 10.20             |   | Agreement of Lease dated as of April 24, 2002 between Level 3 Communications LLC and Rackspace SATDC, Ltd., as amended April 16, 2004 (1) |
| 10.21             |   | Assignment of Lease effective December 1, 2006 between Qwest Communications Corporation and Rackspace DAL1DC Management, LLC with attached Lease dated January 26, 2000 between CSI Industrial Development L.P. and Qwest Communication Corporation, as amended January 23, 2001 (1) |
| 10.22             |   | Third Amendment to Lease Agreement dated January 8, 208 between CLPF-Heritage Four, L.P. and Rackspace DAL1DC Management LLC (1) |
| 10.23             |   | Consent to Assignment and Other Agreements dated November 30, 2006 by and among CLPF Heritage Four L.P., Macro Holding, Inc., Qwest Communications Corporation, and Rackspace DAL1DC, Ltd. (1) |
| 10.24             |   | Deed of Lease dated January 16, 2003 between Williams Communications, LLC and Rackspace IAD1DC, Ltd. (1) |
| 10.25             |   | Agreement for Lease dated April 2, 2007 between Slough Trading Estate Limited and Rackspace Managed Hosting Limited (1) |
| 10.26             |   | Amended and Restated Revolving Credit Agreement dated August 31, 2007 between Comerica Bank and Rackspace US, Inc., as amended October 11, 2007, December 7, 2007, February 25, 2008, and April 23, 2008 (1) |
| 10.27             |   | ISDA Master Agreement and Schedule between Comerica Bank and Rackspace US, Inc. dated September 26, 2007 (1) |
| 10.28             |   | Offer letter from the Registrant to Klee Kleber dated February 5, 2007 (2) |

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| 10.29        |   | Global Amendment to the Registrant’s 1999 Assumed Stock Option Plan, 2003 Stock Option Plan, 2005 Non-Qualified Stock Option Plan, Webmail.us, Inc. 2004 Stock Incentive Plan and Amended and Restated 2007 Long-Term Incentive Plan (2) |
|--------------|--------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 10.30        |   | Compromise Agreement between Rackspace Limited and Doug Loewe dated June 26, 2008 (3)                                                                                                                                                |
| 10.31        |   | Lease agreement between Rackspace Asia Limited and PCCW Powerhouse Data Center Services (HK) Ltd. dated July 3, 2008 (3)                                                                                                             |
| 10.32        |   | Offer letter from the Registrant to Bruce Knooihuizen, dated December 19, 2007 (11)                                                                                                                                                       |
| 10.33        |   | Severance and Release Agreement between the Registrant and David Belle-Isle, dated October 31, 2008 (11)                                                                                                                                  |
| 10.34        |   | Offer letter from the Registrant to John Lionato, dated April 3, 2008 (11)                                                                                                                                                                |
| 10.35        |   | Option Exercise Extension Agreement between the Registrant and Glenn Reinus, dated December 31, 2008 (11)                                                                                                                                 |
| 10.36        |   | Non-Employee Director Compensation Schedule (11)                                                                                                                                                                                               |
| 10.37        |   | Offer letter from the Registrant to James Lewandowski, dated September 9, 2008 (11)                                                                                                                                                       |
| 10.38        |   | Rackspace Standard Form of Employment Agreement (11)                                                                                                                                                                                           |
| 10.39† |   | Lease Agreement by and between Grizzly Ventures LLC and Rackspace US, Inc. (5)                                                                                                                                                                 |
| 10.40        |   | Amendment to Offer Letter, dated May 14, 2009, by and between Rackspace US, Inc. and John Lionato (6)                                                                                                                                          |
| 10.41        |   | Fifth Amendment to Amended and Restated Revolving Credit Agreement (7)                                                                                                                                                                         |
| 10.42        |   | Amendment Number One to the Economic Development Agreement between the State of Texas and Rackspace US, Inc. (8)                                                                                                                               |
| 10.43† |   | Lease Agreement by and between Tarantula Ventures LLC and Rackspace US, Inc. (9)                                                                                                                                                               |
| 10.44        |   | Service Order and Statement of Works between Equinix (UK) LTD and Rackspace LIMI (9)                                                                                                                                                           |
| 10.45        |   | First Amendment to Lease Agreement by and between Grizzly Ventures LLC and Rackspace US, Inc. (10)                                                                                                                                             |
| 10.46        |   | Employment Agreement between Rackspace US, Inc. and Mark Roenigk, dated December 14, 2009 (12)                                                                                                                                                 |
| 21.1         |   | List of subsidiaries of the Registrant (11)                                                                                                                                                                                                    |
| 23.1         |   | Consent of KPMG LLP, Independent Registered Public Accounting Firm. (12)                                                                                                                                                                       |
| 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 Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (12)                                                                                                                                        |
| 32.2         |   | Certification of Chief Financial Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (12)                                                                                                                                        |
|         |   |                                                                                                                                                                                                                                           |
| †      |   | Confidential treatment has been requested for portions of these exhibits.  These portions have been omitted from this Quarterly Report on Form 10-Q and submitted separately to the Securities and Exchange Commission.              |
| (1)          |   | Incorporated by reference to the Company’s Registration Statement on Form S-1 (File No. 333-150469), filed April 25, 2008.                                                                                                     |
| (2)          |   | Incorporated by reference to the Company’s Amendment No. 1 to the Registration Statement on Form S-1 (File No. 333-150469), filed June 18, 2008.                                                                     |
| (3)          |   | Incorporated by referenceto the Company’s Amendment No. 2 to the Registration Statement on Form S-1 (File No. 333-150469), filed July 15, 2008.                                                                      |
| (4)          |   | Incorporated by reference to the Company’s Amendment No. 1 to the Registration Statement on Form S-8 (File No. 333-153009), filed February 4, 2009.                                                                                 |
| (5)          |   | Incorporated by reference to the Company's Quarterly Report on Form 10-Q for the Quarter ended March 31, 2009 (File No. 001-34143), filed May 12, 2009.                                                                                        |
| (6)          |   | Incorporated by reference to the Company's Current Report on Form 8-K (File No. 001-34143), filed May 20, 2009.                                                                                                                                |
| (7)          |   | Incorporated by reference to the Company's Current Report on Form 8-K (File No. 001-34143), filed June 23, 2009.                                                                                                                               |
| (8)          |   | Incorporated by reference to the Company's Current Report on Form 8-K (File No. 001-34143), filed July 30, 2009.                                                                                                                               |
| (9)          |   | Incorporated by reference to the Company's Quarterly Report on Form 10-Q for the Quarter ended June 30, 2009 (File No. 001-34143), filed August 13, 2009.                                                                                      |
| (10)         |   | Incorporated by reference to the Company's Quarterly Report on Form 10-Q for the Quarter ended September 30, 2009 (File No. 001-34143), filed November 12, 2009.                                                                               |
| (11)         |   | Incorporated by reference to the Company's Annual Report on Form 10-K for the Year ended December 31, 2008 (File No. 001-34143), filed March 2, 2009.                                                                                          |
| (12)         |   | Included in the Company’s Form 10-K for the year ended December 31, 2009 that was previously filed with the SEC on February 26, 2010.                                                                                                    |

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| Date: July 19, 2010   | Rackspace Hosting, Inc. |
|---------------------------------|-------------------------|
|                            |                    |   |
|                            | By:                |     /s/ A. Lanham Napier |
|                            |                    |     A. Lanham Napier, Chief Executive Office, President, and Director |
|                            |                    |     (Principal Executive Officer) |

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