We are in a coexistence mode with exchange 2007 and 2010. For some reason we migrated some users that are still using xp machines and outlook 2003 and some xp machines and outlook 2010. All the xp machines cannot connect rpc over http connectivity to our 2010 exchange server. If i connect them using our vpn client there is no trouble with connectivity. All machines with windows 7 or 8 have no trouble connecting with outlook 2007 or 2010? Saw some threads about encryption but we have that requirement turned off on our cas servers. We have a 2 server cas array setup with NLB and 2 DAG mailbox servers setup. Dont understand why windows 7 and 8 machines work fine but not xp machines? Any help is appreciated..
Michael Duhon