Exchange 2010 CAS Upgrade milestones

If you have a mixed environment that includes Exchange 2003 frond-end and Exchange 2007 Cas servers and planning to upgrade Excahnge 2010 CAS server, consider following key points;

  • If the Exchange 2007 mailbox is in the same AD Site as CAS2010, CAS2010 will silently redirect the session to the Exchange 2007 CAS.
  • If the Exchange 2007 mailbox is in another Internet facing AD Site, CAS2010 will manually redirect the user to the Exchange 2007 CAS.
  • If the Exchange 2007 mailbox is in a non-Internet facing AD site, CAS2010 will proxy the connection to the Exchange 2007 CAS.
  • If the mailbox is Exchange 2003, CAS2010 will silently redirect the session to a pre-defined URL.

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