Your Exchange Server administrator has blocked the version of Outlook that you are using. Contact your administrator for assistance.

This morning I have noticed about an issue with Outlook 2003,

No user can connect to Exchange 2010 from Outlook 2003 version, but users affected by this incident are able to connect to their mailbox using OWA , mobile phones ,Outlook 2010 or 2013 version.

All Mailboxes have been migrated from Exchange 2003 to Exchange 2010 and legacy Servers have been decommissioned from the Organization a few days ago.

A user with Outlook 2003 get the following error when he try to connect to his own mailbox.

Your Exchange Server administrator has blocked the version of Outlook that you are using. Contact your administrator for assistance.

I ran the following cmdlets to check for any blocked parameters enabled on CAS Servers, but I didn´t found anything about.

  • Get-CasMailbox | Ft, name, MAPI*
  • Get-RpcClientAccess –server  “myExchangeserver” | fl blocked*,encryption*

After a while I found the solution,

Public Folder hierarchy and database have been removed yesterday because is not used anymore by the Organization.

Note: Remove Public Folders is not a recommended practice if you still have Outlook 2003 clients in your Organization. Outlook 2003 has some dependencies with Public Folders, especially for free busy and OAB.

Creating a new Public Folder Database on Exchange 2010 the problem was solved. I forced OAB to be published in the new Public Folder Database  and forced also to be assigned to each Mailbox Database.

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