Hi im experiencing a rather strange problem with some Outlook 2007 clients.
I have a Exchange 2007 infrastructure in coexistance with Exchange 2013:
- All DNS records correctly setted up
- All URLs and autodiscovery correctly setted up
- 75 clients with Outlook 2007 and 2013 were migrated to Exch 2013 and are working correctly
All seems right from the infrastructure side, but I m having 6 mbxs (migrated to Exch 2013) that cannot connect.
Running outlook /rpcdiags shows:
- Directory - Connected to FQDN of DC [Here I should have mbxguid]
- Mail - Connecting... to [mbxguid]@[domain] - This connection retries several times
The mail connection retries several times till it fails with: Cannot start microsoft outlook. Cannot open outlook window....
So.. I already check the usual suspects:
- Outlook 2007 has the Nov 2012 patch
- Client can resolve all URLs
- Encypt connection is enabled
- Correct Outlook Anywhere settings
After that I repaired the profile and outlook connected, to my surprise when I checked rpcdiag I got:
- Directory - Connected to FQDN of DC
- Mail - Connected to FQDN of Exch 2013 MBX Server
Never saw a client connecting with FQDN to an Exch 2013....
The next day the error shows up again and the temporal solution is to repair the profile, and having the same results.
I check if the "DS Server" value in HKEY_CURRENT_USER\Software\Microsoft\Exchange\Exchange Provider was configured on the client and server side, but it was not present:
https://support.microsoft.com/en-us/help/319206/how-to-configure-outlook-to-a-specific-global-catalog-server-or-to-the
Why would those particular Outlooks try to connect with the FQDN instead of the MBX Guid?
Regards