Dynamics CRM Engineering Team has released DST fixes to align Microsoft Dynamics CRM application with the windows cumulative time zone update discussed in the following article:
Currently there is a fix available for Dynamics CRM 4.0, to receive this fix please log a support incident with the Microsoft Dynamics CRM support Team.
2936902 Daylight saving time (DST) fix for Microsoft Dynamics CRM 4.0 with Update Rollup 21
The fix for Microsoft Dynamics CRM 2011 will be included within the next Update Rollup release, which will be Update Rollup 17.
Dynamics CRM Support Team