Would you have the users continue to use OWA 5.5 to access Exchange Server 2003 until everyone is cut over, then switch everyone over to OWA 2003? I know OWA 2003 is not backward-compatible. Some articles I've read say OWA 5.5 can access Exchange Server 2003, and some say you can't.
If you are in the middle of a migration from Exchange 5.5 to Exchange Server 2003, you need to wait and cut everyone over at the same time as you cannot access Exchange 5.5 mailboxes with the Outlook Web Access (OWA) 2003 interface.
The following table from Microsoft articulates the various options you have in this scenario:
|Outlook Web Access versions available to users|
Outlook Web Access was changed significantly along the various releases of Exchange Server. Even the Exchange 2007 OWA experience has more advanced features and functionalities than its predecessors.
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This was first published in June 2006