http://blogs.technet.com/vik/archive/2007/02/02/exchange-2007-and-exchange-2003-coexistance-for-mobile-access.aspxMany Organizations aren't ready to upgrade their entire Enterprise to Exchange 2007 however they do want to take advantage of the new Mobile features and policies offered by Exchange 2007. Many of these new management and monitoring features can be obtainedenCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.technet.com/vik/archive/2007/02/02/exchange-2007-and-exchange-2003-coexistance-for-mobile-access.aspx#660121Fri, 23 Feb 2007 21:36:15 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:660121subject: exchange<p>Exchange 2007 Discontinued Features The 10 most common Exchange Server issues and how to avoid them Exchange</p> http://blogs.technet.com/vik/archive/2007/02/02/exchange-2007-and-exchange-2003-coexistance-for-mobile-access.aspx#660997Sat, 24 Feb 2007 17:58:30 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:660997lynxlynx<p>I have a little question...</p> <p>Can one have 1 CAS 2007 server for mobile access/policies and keep a couple of old frond end 2003 servers for a while?</p> <p>of course its cost related..but we are looking to migrate in steps..and I would like to migrate the mobile users with the new security policies first!</p> http://blogs.technet.com/vik/archive/2007/02/02/exchange-2007-and-exchange-2003-coexistance-for-mobile-access.aspx#704740Fri, 23 Mar 2007 03:25:40 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:704740Vik<p>Using an Exchange Server 2003 front-end server together with an Exchange 2007 Mailbox server is not supported however you can use both E2K7 and E2K3 Frontend Servers together. &nbsp;</p> <p>You would have to make sure that no user connecting to the exchange 2003 FE is on a E2K7 Mailbox server.</p>