Solving Outlook 2010 – “Cannot start Microsoft Outlook cannot open the Outlook Window.”

After removing my Office 2010 CTP version and install the Office 2010 Beta back in November 2010, I encounter the problem of not able to use my Outlook 2010 Beta. I was getting the following popup window:

After trying the following methods:

1. Log the error in the “Microsoft.beta.o14.client.outlook Forum” (special Thanks to all that try to help me).

2. Uninstall/reinstall Outlook 2010 client with no luck.

3. Make sure all Outlook files, including the hidden ones, and Temp folders were remove from the disk. Didn’t work.

4. Even try to use the “/resetnavpane” outlook switch with no luck.

5. And, got nasty with the registry – no luck here neither.

I was still getting the same popup error message and not able to open my Outlook. Very Frustrating!!  I was to the point of … Do I need to rebuild my laptop?  HELL NO!!  Then, I decided to attack the issue again and try to fix it.

I realized the Outlook Setup Wizard wasn’t starting (hint!!). So, I decide to search for “Outlook connection Wizard not starting” and I found this blog about “Set Up Outlook for Exchange 2010”: Although, this was not related to the problem I was having but indirectly lead me in the right direction.

With my previous Office 2010 CTP version, I was able to setup my emails and after removing the application to install the Beta, I lost. I realized now the un-install didn’t remove some folders. The “Outlook Files” folder contain my older version *PST file, still exist in my user “Documents”.

So, here’s HOW-TO clear the error:

1. Go to your Document folder.

2. Delete the "Outlook Files" folder.

3. Then, open "Control Panel", Click on "User Accounts" and then "Mail".

4. In "Mail", remove all the emails you setup for the previous email client.

5. Create new email account(s) and pick the default email address.

After these steps, you Outlook 2010 Beta application should open without any errors.

That’s it!!!  This is how I solved my problem and clear the error.

Hope someone will benefit from this blog.



About maxt2posh

I’m from Puerto Rico, have been working with computers since 1979. Throughout many years, I have worked with SQL Server Technologies, provided support to Windows Servers/Client machines, Microsoft Virtualization Technologies, and build some Visual Studio solutions. I’m a Microsoft PowerShell MVP since 2009 and MVP SAPIEN Technologies since 2010. I speak in most of the SQLSaturday, IT Pro and .NET camps events around the Florida’s State. Also founder of the Florida PowerShell User Group which meeting every 3rd Tuesday evening of the month.
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20 Responses to Solving Outlook 2010 – “Cannot start Microsoft Outlook cannot open the Outlook Window.”

  1. Dear Sir,
    Please provide solution for following error.
    Cannot start Microsoft Office Outlook. Cannot Open the Outlook window

    Please note that our try for following solving data but not ur issue solve
    “Outlook.exe /resetnavpane”

  2. Anonymous says:

    Thank you very, very much for this. I had the same problem for a while and I was extremely frustrated with it. I never thought the problem was so simple. Thank you very much again!

  3. JGT1942 says:

    Excellent!!!! This resolved my problem. BIG THANKS

  4. Anonymous says:

    Could you please tell me: will all my old emails be deleted by this operation, or will they all reappear when I have created the email addresses again?

  5. Anonymous says:

    Thanks, this has help a lot!!!

  6. Anonymous says:

    thanks its easy to fix

  7. Anonymous says:

    Fair play, I spent a couple of days trying to fix this. Delighted to come across your post. Fixed in a few minutes.

  8. Anonymous says:

    THANK YOU SOOOOO MUCH!! Can’t live without my e-mail !

  9. Robert says:

    Thanks for sharing the useful post. I came across one more solution for this problem :

  10. ost to pst says:

    Hey there this is somewhat of off topic but I was wanting to
    know if blogs use WYSIWYG editors or if you have to manually code with HTML.
    I’m starting a blog soon but have no coding experience so I wanted to get guidance from someone with experience. Any help would be enormously appreciated!

  11. Anonymous says:

    Worked for me too… Nasty problem right before my MS certification… THANKS!

  12. Anonymous says:

    thanks solved

  13. Benas62 says:

    Fuck You. Fuck Off.

  14. I actually think this amazing article , “Solving Outlook 2010 – Cannot
    start Microsoft Outlook cannot open the Outlook Window. | maxt2posh”,
    relatively pleasurable plus the blog post was indeed a good read.
    Thanks for the post-Zack

  15. Abdulaziz says:

    I cannot configure out look email

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  17. Marco says:

    Installing Windows Search 4.0 resolved the problem for me.

  18. nick1 says:

    you can try to perform a quick repair the existing office installation.
    I don’t recommend an online installation as it may reset the activation settings.
    for more understanding, I hope the below link should be useful for you.

  19. Chhavi says:

    Thanks for sharing such a useful post. But I also faced the same problem in last week. Then at that time i came across to one more utility i.e. third party solution. It is easy to use also and takes couple of minutes to resolve such type of an error. If anyone else want to try its demo version then visit at.

  20. albertjohny says:

    Thank for providing such a useful information. Take a look here It might help you !

    Hope it helps.
    Best Regards,

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