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Deleted's avatar
Deleted
May 01, 2023

Exchange 2013/2019 coexistence and client connectivity to new 2019 problem

Hey all,   Some details first: Forest/Domain functional level: 2012 R2 (only one domain) 2 x Exchange 2013 CU 23 Servers in a DAG (both on Server 2012) 1 x Exchange 2019 CU 12 server (Server 202...
2013
2019
Exchange Server
outlook
Dan_Snape's avatar
Dan_Snape
Iron Contributor
May 02, 2023
Generally client connectivity is controlled by DNS. The version does give a good indication though. Try the test email configuration utility and that will show you what URLs are returned to the client for connectivity.
Deleted's avatar
Deleted
May 02, 2023

Dan_Snape 

Definitely connected to the correct url's, just want to be sure that I am using 2019 for client access.

 

There was that issue with random disconnects after first changing my hosts file so I'm not sure what was happening in the background (maybe that ol' black magic like the Send Connectors :smile:).

 

EDIT: Test Email AutoConfiguration and Connection Status all show https://webmail.domain.com/XXXXX for all connections.  Browsing to https://webmail.domain.com/ecp shows the 2019 console.

 

The version in Connection Status shows the 2013 server version.  Do we know if this is because my mailbox is still on 2013 (and this is the mailbox database version), or does it show this because 2019 is transparently proxying the request and Outlook assumes it is connected directly to a 2013 server?

 

 

  • Dan_Snape's avatar
    Dan_Snape
    Iron Contributor
    May 04, 2023
    I'd say it was the latter...but not 100% sure
    • Deleted's avatar
      Deleted
      May 04, 2023
      I had another user change their hosts file and their Outlook just worked like normal, no disconnections. They also have a few shared mailboxes linked.

      I can see their username and pc ip in the iis logs of the 2019 server so they are connecting through it.

      Next test is migrating the mailbox of my test user on 2013 to 2019 and see how that goes!
      • Deleted's avatar
        Deleted
        May 08, 2023

        Regarding the version numbers in Connection Status...

         

        I have a test account that I migrated from 2013 to 2019 (successful!) and when looking at the version it shows this:

         

        The stray 15.0 is for the Public Folder Hierarchy (which we don't use).  So far so good... so what! (hehe).

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