has yanked updates before. In April, it for Windows 2000 -- which at the time was still being supported -- over what it called "quality issues."

In early 2008, Microsoft designed to prep Windows Vista for Service Pack 1 (SP1) after users flooded support forums with tales of endless reboots.

Microsoft has not set a timetable for releasing a re-patch for Outlook 2007.

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at or subscribe to . His e-mail address is .

in Computerworld's Security Topic Center.