In order to comply with the new 2007 Daylight Saving Time rules, Microsoft issued a downloadable patch to fix Windows XP SP2. They also set the patch to install automatically with Windows Updates.

Microsoft also issued a program, TZMove, which is used to fix calendar entries to comply with the new rules.

Unfortunately, a bug was discovered in TZMove. This bug causes Outlook calendar entries that were created after the patch was installed to be "fixed" even though they are already correct. This only happens to single-instance (i.e. non-recurring) calendar entries, if they occur in the three week period beginning March 11th or the week ending November 4th, 2007.

There is now a hotfix to fix TZMove, but that doesn't help if it was already run.

If you think you might be affected, carefully review your calendar entries for the three weeks beginning March 11th and correct the ones that were improperly "fixed".

Note that, in most cases, this problem does not affect Windows 2000 or Windows XP SP1. Nor does it affect you if you do not use Outlook Calendaring. It also doesn't affect you if you installed the patch and then immediately ran TZMove.

The TerraSage Team
support@terrasage.com