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                                                                   EXHIBIT 10.20

February 23, 2006

President
BISYS, Inc.
90 Park Avenue
New York, NY 10016

Ladies and Gentlemen:

Reference is made to that certain Software License Agreement effective as of
September 1, 2003 by and between Open Solutions Inc. ("OSI") and BISYS, Inc.
("BISYS"), as amended (the "Agreement") and to the letters dated October 10,
2005 and January 26, 2006 from OSI to BISYS. OSI and BISYS hereby further agree
as follows:

1.      Any defined terms used in this letter shall have the meaning ascribed to
such defined term in the Agreement.

2.       The date by which BISYS is entitled to terminate the limited
non-compete obligations of OSI for a region pursuant to Section 4(b) of the
Agreement, and thereby automatically terminate OSI's Most Favored Customer
obligations and BISYS' Minimum Fee Payment obligations for such region (subject
to the 9 month continuation provision of Section 4(b)(4)), among other things,
is hereby extended eight (8) additional days from February 28, 2006 to March 8,
2006 ("Extension Period"), subject to the following:

         o        BISYS shall continue to pay Minimum Fee Payments to OSI during
                  the Extension Period in accordance with the Agreement; and

         o        If BISYS elects to terminate the limited non-compete
                  obligations of OSI for a region on or before March 8, 2006,
                  such election shall be deemed to have been made on October 10,
                  2005 so that the delayed election shall not cause BISYS to pay
                  more in Minimum Fee Payments with respect to such region than
                  it would have been required to pay if such election had been
                  duly made on October 10, 2005.

3.       This letter agreement shall constitute an amendment of the Agreement in
accordance with the terms and conditions thereof. In all other regards the
Agreement shall remain and continue in full force and effect as amended through
the date hereof.

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BISYS, Inc.
February 23, 2006
Page -2-

Please acknowledge your agreement to the foregoing by countersigning this letter
agreement in the place provided below and returning it to the undersigned,
whereupon this letter agreement shall become effective as of the date first
above written.

Very truly yours,

OPEN SOLUTIONS INC.

By: /s/ Kenneth J. Saunders
    ----------------------------------------------
    Name: Kenneth J. Saunders
    Title: Executive Vice President & Chief Financial Officer

ACCEPTED AND AGREED AS OF THE DATE FIRST WRITTEN ABOVE:

BISYS, INC.

By: /s/ Bruce D. Dalziel
    -----------------------------------------------
    Name: Bruce D. Dalziel
    Title: EVP + CFO<PAGE>

                                                                   EXHIBIT 10.22

                              FIFTH LEASE AMENDMENT

         This FIFTH AMENDMENT TO LEASE AGREEMENT (the "FIFTH AMENDMENT") is
entered into this 16th day of January, 2006 by and between WB Partners LLC, a
Connecticut limited liability company (the "LESSOR") and Open Solutions Inc., a
Delaware corporation ("LESSEE").

                                   WITNESSETH

         Whereas, Lessee and Lessor's predecessor-in-interest entered into that
certain Lease Agreement dated February 29, 1996, which agreement was amended by
a First Amendment dated January 27, 1998, a Second Amendment dated May 25, 1999,
a Third Amendment dated September 16, 1999 and a Fourth Amendment dated November
29, 2000 (collectively, the "LEASE") for certain premises located at 300 Winding
Brook Drive, Glastonbury, Connecticut, all as more particularly described in the
Lease, and

         Whereas, Lessor and Lessee desire further to amend the Lease as
follows:

         Now, therefore, for and in consideration of the mutual covenants and
conditions set forth herein and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, Lessor and Lessee
hereby agree to amend the Lease as follows:

         1.       The term of the Lease and the Rent payable thereunder are
                  amended as follows:

                  a.       DATA CENTER: Lessee's right to occupy that portion of
                           the second floor commonly known as the 'Data Center"
                           consisting of approximately 3,240 square feet shall
                           be extended to March 31, 2006 with a total monthly
                           rent of $7,500 payable as provided in the Lease.

                  b.       DEPOSIT: Lessee shall provide a deposit of $20,000.00
                           for the cost of returning the Data Center space to
                           office space. If, on or before March 31, 2006, Lessor
                           is able to lease the Data Center space to a tenant
                           who will utilize the Data Center "as-is", then Lessor
                           shall return the deposit to the Lessee. Otherwise,
                           the Deposit shall be kept by the Lessor.

                  c.       MOVING DELAY: In addition to the rent payable for the
                           Data Center, Lessee shall pay rent of $1,311.67 PER
                           DAY beginning on and including January 7, 2006 and
                           continuing until the Leased Premises have been
                           cleared of ALL of the Lessee's property (excluding,
                           however, any property remaining either in the Data
                           Center or as provided below) and delivered to Lessor
                           broom clean in as good order and repair as when
                           delivered to Lessee (ordinary wear and tear
                           excepted).

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                  d.       FIRST FLOOR SERVER ROOM: Once the Lessee has vacated
                           the premises as provided above for the Moving Delay,
                           and in addition to the rent payable for the Data
                           Center, Lessee shall pay $1,250 per month for the
                           First Floor Server Room consisting of approximately
                           416 square feet, payable as provided in the Lease.
                           The term for the First Floor Server Room shall expire
                           on March 31, 2006.

                  e.       FIRST FLOOR CONFERENCE ROOM: Once the Lessee has
                           vacated the premises as provided above for the Moving
                           Delay, and in addition to the rent payable for the
                           Data Center and First Floor Server Room, Lessee shall
                           pay $1,750 per month for the First Floor Conference
                           Room known as the Lewis and Clark Conference Room,
                           payable as provided in the Lease. The term for the
                           First Floor Conference Room shall expire on January
                           31, 2006.

                  f.       ADDITIONAL PARKING: In addition to any other rent
                           payments, Lessee shall pay Lessor $1,000.00 per month
                           have the right to permit up to thirty (30) additional
                           vehicles to park in the parking lot at 300 Winding
                           Brook Drive, Glastonbury, Connecticut. The right to
                           the parking shall expire on March 31, 2006.

         2.       Lessee and Lessor represent that there are no brokers, agents,
                  commissioned salesperson, or other persons representing Lessee
                  or Lessor in the negotiation for the procurement of this Lease
                  and of the Premises and that no commissions, fees or
                  compensation of any kind are due and payable in connection
                  herewith to any brokers, agents, commissioned salesperson, or
                  other persons. Lessee agrees to indemnify and hold Lessor
                  harmless from all loss, cost and damage (including reasonable
                  attorney's fees and court costs) suffered or incurred by
                  Lessor as a result of a breach by Lessee of the representation
                  made in the immediately preceding sentence or as a result of
                  Lessee's failure to pay commissions, fees or compensation due
                  to any brokers, agent, commissioned salesperson, or other
                  persons who represents Lessee, whether or not disclosed.

         3.       With the exception of the above, all other terms and
                  conditions of the Lease remain in effect. The relationship of
                  the parties is that of Lessee and Lessor.

                     [remainder of page intentionally blank]

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         4.       All capitalized terms used but not defined in this Fifth
                  Amendment shall have the same meaning as in the Lease.

In witness whereof, the parties have hereunto set their hands the day and year
first written above.

                                           WB Partners, LLC

                                           /s/ William Wienke
                                           -----------------------------------
                                           William Wienke
                                           Its: Manager
                                           Date: 1/16/06

                                           Open Solutions Inc.

                                           /s/ Kenneth J. Saunders
                                           -----------------------------------
                                           Kenneth J. Saunders
                                           Its: EVP & CFO
                                           Date: January 16, 2006

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