In February of this year Microsoft issued a patch to fix a time change issue in BizTalk Server. The issue wasn’t specific to any recent change to Daylight Savings Time (DST) but was discovered when we tested BizTalk in preparation for the United States legislation that extended DST this year. This patch should be applied to any BizTalk installation in a region that experiences a seasonal time shift.
If you haven’t already installed the patch you should get it from:
For BizTalk Server 2004: http://support.microsoft.com/default.aspx?scid=kb;EN-US;931960
For BizTalk Server 2006: http://support.microsoft.com/default.aspx?scid=kb;EN-US;931961
The recently released BizTalk Server 2006 R2 already includes the fix. No patch is required for this issue.