Microsoft Confirms Office Patch Gaffes
However, that's not the only Office snafu that Microsoft has acknowledged. The Computerworld article says:
the company has also confirmed that a Feb. 9 non-security hotfix that added support for .Net 4.0 to Office 2007 caused the suite's programs to crash when they were run on Windows Server 2008 R2 or Windows Server 2008 with Terminal Services.
The hotfix has been pulled and replaced with another that corrects the crash problem.