Following the Office 2016 update on July 29, 2015 (to version 16.0.4229.1009), users with Exchange 2007 mailboxes in their profile found they could not connect to their Exchange mailboxes.
The error message said:
The resource that you are trying to use is located on an unsupported version of Microsoft Exchange.
Although this change appeared suddenly and without warning, it was not totally unexpected. Historically, Outlook is supported on three versions of Exchange server. In the case of Outlook 2016, those three versions are Exchange 2016, 2013 and 2010. All Exchange servers in the network need to be on Exchange 2010 or newer.
The short term fix: you’ll need to re-install Office 2013 or revert to an earlier build of Office 2016 (until it expires) if you want to connect using Exchange services and access everything in your mailbox. If you only need to access email, use IMAP.
The long term fix: Exchange 2007 needs to be upgraded to Exchange 2013 or Exchange 2016 if you want to continue to use Outlook 2016.
If you need to view the calendar, set the account up in the Windows Mail app and only sync the calendar.
Published August 2, 2015. Last reviewed on August 2, 2015.