There have been reports of problems with Microsoft patch MS06-013 Cumulative Security Update for Internet Explorer (912812). MS06-016 where the Outlook Express address book disappears. In this case removal of the patch and the address book re-appears, however the other vulnerabilities the patch address come back.

One other Microsoft patch MS06-015 will be updated due to compatibility issues. This was announced in their blog.  http://blogs.technet.com/msrc/archive/2006/04/21/425838.aspx

If you have any issues with a Microsoft patch impacting your system contact them directly, the call is free. In the US or Canada dial: 1-866 - 727 - 2389 ( 866 PC SAFETY ) In other countries/regions, contact your local Microsoft office.

Cheers,
Adrien