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Exchange 2007 to 2013 - Coexistence

    Question

  • Good evening,

    I am currently migrating from 2007 to 2013 and am in the coexistence stage. The issue that I am hoping to find an answer for is this: Some (not all) of the users that have had their mailbox moved from 2007 to 2013 are now being prompted for authentication. What is interesting is that they will be prompted on say Computer A (W7 with Outlook 2007 all updates) and then I can have them go to Computer B (W7 with Outlook 2007 all updates) and they will not be prompted. By that it would seem that it is not user profile specific, but rather computer specific, yet I cannot say that with 100% confidence yet as I feel that there is something in the settings of Exchange 2013 I set incorrectly somewhere.

    I have checked all of the things suggested on the web from the local credential storage to registry settings to reinstalling Outlook, but nothing seems to correct the issue. Now if the user enters their user/pass they connect and are fine until they close/open Outlook again. The other issue that I am seeing is that on these same machines I cannot use Autoconfigure to create their account, rather I have to play this run around game where Exchange resolves as host.domain.com then Outlook cannot open the mailbox, close Outlook, go back to account settings, delete the resolved server, put in domain.com recheck the name and then the server shows in guid format, go to connections, tell Outlook to connect via HTTP, but again still getting prompts for authentication.

    At this point I am looking at opening a ticket with MS and shelling out the cost, but was really hoping someone might have that magic bullet that I cannot seem to locate through the almighty Google.

    Thanks!

    Thursday, July 25, 2013 1:08 AM

Answers

  • As it turns out the cause of the prompt for the users who had moved to Exchange 2013 were the Public Folders that have not yet been migrated off the Exchange 2007 server. Neither I nor Microsoft were able to figure out what within the PF are causing the authentication prompt, but now that I know it is not anything major I am just going to push forward with getting the rest of the users and the PFs off the 07 box and on to the 13 box which should clear that up.
    Friday, July 26, 2013 3:06 AM

All replies

  • Hi,

    Are the workstations that you're getting prompted from authentication bound to the domain? This is important to understand why the autodiscover is not working.

    Exchange 2007 had the ability to use RPC, but Exchange 2013 or later has no RPC to Exchange - it's all RPC over HTTP. I would imagine that you're currently logging in using Basic authentication, and not NTLM/Negotiate, hense why the users are getting prompted for authentication, and not being logged in automatically.

    Check in the Advanced Settings in your Account configuration, on the Connection tab, click "Exchange Proxy Settings", what is the "Proxy authentication settings" set to?


    MCITP Ent. Messaging | MCTS | MCSA | MCP
    http://www.camm.id.au (blog)


    • Edited by Cameron_Murray Thursday, July 25, 2013 3:54 AM updated with how to check auth settings
    Thursday, July 25, 2013 3:52 AM
  • Thank you for the reply.

    Yes, the machines are bound to the domain and they are using NTLM as currently set in the proxy settings.


    Thursday, July 25, 2013 4:21 AM
  • Hello,

    By default, the negotiate authentication is enabled. I recomemend you use the authentication to check the result.

    I recommend you use test e-mail autoconfiguration to check your autodiscover settings.

    Please Hold down the CTRL key, right-click the Outlook icon in the system tray and click test e-mail autoconfiguration.


    Cara Chen
    TechNet Community Support

    Thursday, July 25, 2013 6:52 AM
  • As it turns out the cause of the prompt for the users who had moved to Exchange 2013 were the Public Folders that have not yet been migrated off the Exchange 2007 server. Neither I nor Microsoft were able to figure out what within the PF are causing the authentication prompt, but now that I know it is not anything major I am just going to push forward with getting the rest of the users and the PFs off the 07 box and on to the 13 box which should clear that up.
    Friday, July 26, 2013 3:06 AM