Microsoft Corporation Tel 425 882 8080 One Microsoft Way Fax 425 936 7329 Redmond, WA 98052-6399 http://www.microsoft.com/ February 11, 2004 [GRAPHIC] Patricia Montalvo Timm VP, Corporate Governance and Assistant Corporate Secretary Borland Software...

EXHIBIT 10.66

Microsoft Corporation		Tel 000 000 0000
One Microsoft Way		Fax 000 000 0000
Redmond, WA 98052-6399		xxxx://xxx.xxxxxxxxx.xxx/

February 11, 2004

[GRAPHIC]

Xxxxxxxx Xxxxxxxx Xxxx

XX, Corporate Governance and

Assistant Corporate Secretary

Borland Software Corporation

000 Xxxxxxxxxx Xxx

Scotts Valley, CA 95066-3249

Re: Extension of the Microsoft Corporation Open Tools License Agreement

Dear Xxxxxxxx,

Microsoft Corporation (“Microsoft”) and Borland Software Corporation (then Inprise Corporation) (“Borland”) entered into the Microsoft Corporation Open Tools License Agreement effective as of March 2, 1999 as amended on June 2, 1999 (“Agreement”). The Agreement is scheduled to expire on March 2, 2004.

Pursuant to this letter agreement, Microsoft and Borland agree to extend the term of the Agreement until May 2, 2004. Neither party will be obligated to make any payments to the other party as a result of this extension, and neither Microsoft nor Borland shall have any obligation to extend the term of the Agreement beyond May 2, 2004.

Please signify Borland’s agreement to the terms of this letter by countersigning where indicated below.

Best Regards,

/s/ Xxxxx Xxxxxxxxx

Xxxxx Xxxxxxxxx

General Manager

.NET Developer Platform

ACKNOWLEDGED AND AGREED TO BY XXXXXXX:

/s/ Xxxxxxxx Xxxxxxxx Xxxx

By:

Xxxxxxxx Xxxxxxxx Xxxx

Name:

VP, Corporate Governance

Title:

2/6/04

Date:

Microsoft Corporation is an equal opportunity employer.