Microsoft Office Communications Server 2007 R2 Hotfix KB 968802 http://www.microsoft.com/downloads/en/details.aspx?FamilyID=b3b02475-150c-41fa-844a-c10a517040f4
Microsoft Office Communicator 2007 R2 Hotfix KB 2291453 http://www.microsoft.com/downloads/en/details.aspx?FamilyID=515d6dba-4c6a-48bb-a06a-d99c5742676d
Office Communicator Phone Edition (2007 R2) http://www.microsoft.com/downloads/en/details.aspx?FamilyID=565595be-6cf3-4a61-a1e4-12555749ca64
Microsoft Office Communications Server 2007 R2 XMPP Gateway Hotfix KB 2404570 http://www.microsoft.com/downloads/en/details.aspx?FamilyID=80b4e42d-6548-46f4-87b1-7fa0faf80b82