Microsoft released Hotfix Rollup 2 for Forefront Protection 2010 for Exchange Server (KB2420647).

Here’s the list of fixes included in this rollup:

1. Out of memory state occurs when running a manual scan in Forefront Protection for Exchange
2. The link provided by Forefront Protection for Exchange to request removal from the SpamHaus block list wrong
3. Forefront Protection for Exchange does not display data in multiple console fields and mail cannot be sent externally
4. When starting a Windows Server 2008 R2 server running Exchange and Forefront Protection for Exchange, startup times are exceptionally long
5. Forefront Protection for Exchange falsely detects legitimate attachments as Corrupted Compressed files
6. File filtering does not occur in Forefront Protection for Exchange
7. A Forefront Protection for Exchange antivirus engine fails to load and mail is deleted
8. Forefront Protection for Exchange quarantines a blank message when taking action on a subject line filter
9. When installing FPE on Data Availability Group cluster (DAG), Domain Administrator privileges are required
10. Messages cannot be scanned because the FSCController service in Forefront Protection for Exchange is stuck in a continuous loop
11. “The Expiration Date is not valid” is returned when you try to enter a new expiration date in Forefront Protection for Exchange
12. The Forefront Protection for Exchange Administrator console hangs for several minutes when you navigate to the Filter Lists section
13. Cannot uninstall Forefront Protection for Exchange on a non-clustered server
14. Transport Scan process is not safely aborted after an out-of-memory condition occurs
15. The FSCTransportScanner.exe process in Forefront Protection for Exchange may stop responding, and this generates a Dr. Watson crash that references Bucket ID 1211603866
16. Filter Lists display an incorrect scan action in the Forefront Protection for Exchange Administrator console
17. FSCController.exe is reloaded many times whenever the Start-SignatureUpdate cmdlet is run on a cluster running Forefront Protection for Exchange
18. Submission queues in Exchange 2007 or 2010 fill when making a configuration change in the Forefront through the administrator or through Power Shell

For more details on the fixes consult the related knowledge base article (KB2420647). You can download the Forefront Protection 2010 for Exchange Server Hotfix Rollup 2 here.