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https://www.definit.co.uk/2008/09/fixing-outlookr-mobile-access-is-supported-only-on-microsoftr-exchange-server-2003-currently-your-mailbox-is-stored-on-an-older-version-of-exchange-server-on-outlook-mobile-access-under-serv/
Fixing “Outlook(R) Mobile Access is supported only on Microsoft(R) Exchange Server 2003. Currently your mailbox is stored on an older version of Exchange server.” on Outlook Mobile Access under Server 2003