Microsoft published Update Rollup 6 for Exchange Server 2007 Service Pack 1. Update Rollup 6 for Exchange Server 2007 Service Pack 1 (KB959241) is now available for download: http://www.microsoft.com/downloads/details.aspx?FamilyID=93cb3f66-ae72-4356-bdbf-35029cff6df1&displaylang=en

Update Rollup 6 for Exchange Server 2007 SP1 fixes the issues that are described in the following Microsoft Knowledge Base articles:

• Article ID 950675- Downloaded .xls file attachments are empty when you open the files by using Outlook Web Access on Exchange Server 2007 Service Pack 1.

• Article ID 955443 – Some free/busy messages are not replicated from Exchange 2007 to Exchange 2003 servers after some mailboxes are migrated from Exchange Server 2003 to Exchange Server 2007.

• Article ID 956536 - The Microsoft Exchange File Distribution service uses lots of memory and processor time when Exchange Server 2007 processes many OABs.

• Article ID 956624 – The Microsoft Exchange Transport service crashes continuously after you enable journal rule or deploy an antivirus application on an Exchange Server 2007 server.

• Article ID 957748 - The custom message class of contact object is overwritten by the normal IPM.Contact class when an Exchange 2007 server replicates the contact object to any other public store.

• Article ID 959239 – MS09-003: Vulnerabilities in Microsoft Exchange could allow remote code execution.