DSProxy and Cached Exchange mode
Posted on 2010-01-05
We are running Exchange 2007 SP1 and AD 2003.
All our Exchange servers are located in HQ. We also have a GC/DC in Branch1 which has about 200 users. All users connect via Outlook 2007 and are set to cached Exchange mode.
From what I understand, there is a process named DSProxy that Exchange uses to refer Outlook to a GC that is in the same site as the Exchange mailbox server. From then on, Outlook uses this GC for address lookups etc.
At the same time, I understand that when Outlook is in cached Exchange mode, it uses the Offline Address Book (OAB) for address book functionality. The OAB is held on a Public Folder.
So, my question is, if Outlook is set to cached mode and uses the OAB, then why does it still need to contact a GC directly? From what I can recall, if I check the connection status of Outlook when in cached mode, I can still see GC's listed for directory access?
Secondly, if there is a need for Outlook to access a GC directly, is it possible to make a change on Exchange so that Outlook uses a local GC, not the one in the same site as Exchange?