Microsoft released Hotfix Rollup 4 for Forefront Protection for Exchange Server (KB2619883).

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

1. Email is sent to the Forefront Protection for Exchange UNDELIVERABLE folder instead of being delivered
2. UNC and proxy credentials are stored in clear text in the Forefront Protection for Exchange file system
3. The Forefront Protection for Exchange FSEMachinePrep.exe fails with a fatal error
4. The external sender does not receive the expected Forefront Protection for Exchange generated notification
5. Forefront Protection for Exchange generates a notification with a blank subject line
6. Forefront Protection for Exchange virus engine updates fail between the passive node and active node in CCR clusters
7. Forefront Protection for Exchange only accepts 7-digit License Agreement numbers
8. Forefront Protection for Exchange generates a 2098 event ID every time the MSExchangeTransport service is restarted
9. Email queues at startup on an Exchange server running Forefront Protection for Exchange

For more details on the fixes consult the knowledge base article. You can request the hotfix rollup directly from the support center here.