ERM is NOT affected by the DST change. The Exchange server provides time and time zone information to ERM. As a result, ERM does not require any patches or updates related to the DST change. If all the appropriate patches and tools from Microsoft are correctly applied to your organization’s servers and workstations, ERM should continue to process the resource meeting requests properly. Microsoft's current recommendation is as follows:
http://support.microsoft.com/gp/cp_dst
http://support.microsoft.com/kb/933360
Apply Server patch KB933360 (replaces 931836)
Apply Workstation patch KB933360 (replaces 931836)
Apply Exchange CDO patch KB926666
You may need to also apply KB932599
Ensure that all affected meetings on the ERM-managed resource calendars in the extended DST period have their "Show time as" set to "Free". To help automate this, you can download a free script1
Run the rebasing tool (MSEXTMZ.Exe) (KB941018) against the Exchange server, rather than the Outlook Time Zone Tool (TZMove.Exe), for all events (recurring/single). You may also have users run the Outlook tool (KB931667)
After rebasing is complete, ERM should process the calendar inboxes and change the value of rebased events to "busy".
Note: DST support is beyond the scope of standard ERM support since issues created by the change in DST procedure and calendar rebasing tools are issues related to the Microsoft workstation/server operating systems and Exchange server environments and not to the function of Simpler-Webb's Exchange Resource Manager.