How-To

Outlook 2010: How To Fix Error Cannot Start Outlook or Open the Outlook Window

This morning while working on my PC, my Outlook 2010 client crashed and refused to re-open. When restarting Outlook it would continually crash displaying the same error messages repeatedly. Here’s how I fixed it.

First the error messages:

“Microsoft Outlook exited without properly closing your Outlook Data file: FILE.OST. Microsoft Outlook must be restarted. If this error message recurs, contact support for Microsoft Outlook for assistance.”

“Microsoft Outlook exited without properly closing your Outlook Data file: FILE.OST. Microsoft Outlook must be restarted. If this error message recurs, contact support for Microsoft Outlook for assistance.”

After clicking OK, the following error message appears:

“Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened.”

“Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened.”

Each time Outlook is opened, the same two errors above display and Outlook will not open.

To resolve the issue, navigate to your Windows Taskbar and find the Microsoft LYNC or OCS chat Client.

find lync chat client on windows task bar

Right click the Microsoft LYNC or OCS chat client and click Exit

Exit lync chat client

Outlook should now open without any issues.


44 Comments

44 Comments

  1. Quintus  

    Thank you for yet another great article. This blog has learned a me a lot of usefull stuff.

    I do have a question:
    ” Right click the Microsoft LYNC or OCS chat client and click Exit”
    What does Microsoft LYNC and OCS chat client has to do with this error? The solution is working perfectly I just don’t understand Why it’s working.

    • Quintus  

      Teached* Teached not learned. Sorry!

      • bystander  

        taught. Strike two.

    • BigJohnMan  

      Lync, or Skype for business now, will connect to the OST file that Outlook uses to get data from your calendar. This data is used to automatically update your chat status to show that you are busy.

  2. “Outlook.exe /resetnavpane” worked for me. Thanks.

    • Great tip. Will need to test htis out. Thnx Miller.

      • bojan  

        i got this error very often, so i shall check this and report if solved permanently.

  3. Ali  

    Great tip. Thanks a lot for your support.

  4. Jmatch83  

    Thanks for the post Steve, this worked.

    @Quintus: this is probably because Lync and Outlook share information (like the .ost file), if Outlook didn’t properly dispose of it’s handle to the file and Lync still has an open connection, then Outlook cannot initiate a handle to the file when you start it up. When Lync is closed, all handles to the file would be closed and the file would be unlocked, ready for another handle.

  5. Jimmy  

    Wow! Spent some time on this one….thanks for the fix!

  6. Peter  

    Hi i do not find the Microsoft LYNC or OCS chat Client. on the task bar. I am suffering from this problem from very long time though outlook resume after restarting. Can you suggest me if there is other way to fix this problem ?

  7. ost2pst  

    SysTools OST Recovery

    • Kip  

      Okay, so where do we find SysTools OST Recovery?

      Thanks bunches!

  8. Kip  

    Never mind! Found it! Thanks!

  9. ra  

    that was incredibly useful, first time i discovered this problem, thank you for the tip.

  10. Anthony  

    That was extremely useful. Thank you!

  11. girish doshi  

    This was helpful, quick one thanks a ton Steve.

  12. Mike  

    thanks so much for the help! I always forget how much Lync and Outlook are so co-dependent.

  13. Ben Northway  

    Cisco Jabber seems to have been the culprit for me. Closing Jabber allowed Outlook 2010 to open. Thanks for the tip!

  14. bojan  

    and this is not a solution because i dont want to close lync every time it happens.
    is there any permanetnt solution?

  15. like a charm. brilliant.

  16. Fernando  

    Thank you!

  17. Gaga  

    Hi,

    It worked .

    I do not know what is the connection b/w both , but it really worked

    thanks !!

  18. Dorian Earl  

    Yes ! It worked very Fine for my Outlook, but I have some more great tool for this troubled of ms outlook, try Kernel for PST repair tool to 2013 (both 32 bit and 64 bit), 2010, 2007, 2003, XP, 2000 and 97 versions of Personal Storage Table documents. Scanpst tool recovers entire Personal Storage Table items including emails, drafts, calendars, journal, notes, tasks, contacts etc.

  19. CJ  

    Awesome Your the best i got an applause from office after fixing my leads system

  20. Staci  

    Thank you so much! What an easy fix!!

  21. How do I find the Microsoft lync on my window 7 computer.I have check my taskbar but cant find anything as such.please I need help.

  22. This worked for me as well…also…we don’t use the usual office communicator but a customized communicator along with my outlook.
    i signed off and restarted Outlook, Bingo!

  23. Well this was some help…
    Thanks Steve!

  24. haj  

    Thanks Steve,

  25. deepak s  

    Worked like magic for me .
    Such simple things cause such a big mess

  26. gowrisankar  

    Thanks Steve,

  27. Ankita  

    Restarting lync helps.. Thanks Steve.

  28. Ravindra  

    thank you very much this is working

  29. vaishnav  

    Great it helped!

  30. rsolanki  

    This worked for me as well

  31. Esther  

    My culprit was Cisco Jabber. It seems like it can be any chat client that connects to your email to display your calendar appointments and meetings. Makes sense now but it wouldn’t have dawned on me on my own. Thanks! 🙂

  32. Subramani M  

    Its very helpful Thank You

  33. satheesh  

    Thank you so much….really helped me a lot

  34. Peter Larsen  

    That is cool – it worked 🙂

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