Update Center for Microsoft Office, Office Servers, and Related Products is a place where you can Find and Manage updates in one place for Office, Forms Server, Groove Server, PerformancePoint Server, Project Portfolio Server, Project Server, Search Server, SharePoint Server, and Windows SharePoint Services. Use the RSS feed on this page and Microsoft Update to automatically receive information about updates and to download the updates themselves.
Here is the list for the recent released update:
2007 Office system
SharePoint Server 2007
Project Server 2007
Search Server 2008
Windows SharePoint Services 3.0
Office 2003
SharePoint Portal Server 2003
Project Server 2003
Windows SharePoint Services 2.0
Office XP
SharePoint Portal Server 2001
Project Server 2002
SharePoint Team Services
For the updated list visit @ Update Center for Microsoft Office, Office Servers, and Related Products
Hope this helps!!!
Exchange Server 2007 SP2 Update Rollup 3 is available to download @ Update Rollup 3 for Exchange Server 2007 Service Pack 2 (KB979784)
Update Rollup 3 for Exchange Server 2007 Service Pack 2 (SP2) resolves issues that were found in Exchange Server 2007 SP2 since the software was released. This update rollup is highly recommended for all Exchange Server 2007 SP2 customers. For the details related to the issue fixed by it refer to Description of Update Rollup 3 for Exchange Server 2007 Service Pack 2.
Important: Before you install an update rollup or a service pack, visit the following Microsoft Web site:
How to Install the Latest Service Pack or Update Rollup for Exchange 2007
For more information about prerequisites, installation instructions, and known issues, visit the following Microsoft Web site:
Applying Exchange 2007 Update Rollups to Clustered Mailbox Servers
This update rollup does not apply to Exchange Server 2007 release to manufacturing (RTM) version or to Exchange 2007 Service Pack 1 (SP1). The series of update rollup packages for Exchange Server 2007 SP2 is independent of the corresponding series of update rollups for Exchange Server 2007 RTM or Exchange 2007 SP1. For a list of update rollups that apply to Exchange Server 2007 RTM or to Exchange Server 2007 SP1, visit the following Microsoft Web site:
How to Obtain the Latest Service Pack or Update Rollup for Exchange 2007
We can refer to the below mentioned articles for configuring and using EWS impersonation for the Exchange 2010:
And here are the links for configuring and using EWS impersonation for the Exchange 2007: