Outlook 2010 Won't Open

Dear Win 7 Forum folks,

From the Office 2010 Pro beta, Outlook worked fine for a few days but now I get an error message: "Cannot start Microsoft Outlook. Cannot open the Outlook window."


I've tried to repair Outlook, cleaned the registry, deleted, reinstalled and rebooted to no avail. I can't find a help file on the Microsoft Web site.

What should I try next?

Thanks in advance.

Thanks a million times for this regedit trick !!! I looked all over & nothing would work. I tried all the uninstallers, reg cleaners, etc, etc. nothing worked.
My problem was this:
When I tried to load MS Outlook I got the following message, and Outlook would not start up.
"Cannot open your default e-mail folder. The file c:\users\username\Appdata\Local\Microsoft\Outlook\username_hotmail.ost is not an Outlook data file (.ost)"


Your trick worked fine: just delete the profiles key.


THANKS!!!

...until I go to restart when Windows 7 tells me it's closing it first. And sometimes Office won't even start on reboot. The pointer wheel spins then stops but the program doesn't open.

Just advised same thing happening with Excel- program was open but then couldn't be found on desktop. W7 said it was closing it for restart though...

Brand new install of Office 2010 on Windows 7 system.

Thanks, Steve

The Regedit solution worked a treat after all else failed. Thanks Captain and here's a big salute.

QUOTE=Capt.Jack Sparrow;421149]Hi Welcome to Seven Forum

Try this
Start-> type; outlook.exe /resetnavpane

Also an try this


Go to Start > Regedit

1. Locate HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem
2. Delete the Profiles key under the Windows Messaging (Subsystem) key.

Hope that Helps[/QUOTE]

I have this same problem and have tried solutions mention here and other places and continue to get the same error message "Cannot start microsoft outlook" I couldn't run the resetnavpane because it would just error. Yes I went to the program files (x86)..... I tried several things - none worked UNTIL I found this regedit- A BIG thank you for this information. I wasn't too upset as I just converted, actually went from is better term, XP Pro 32 bit to Windows 7 Ultimate 64 bit, then loaded Office 2010 Professional Plus. Prior to this I didn't use outlook or anything other than word. What I did use was thunderbird which was fine, but decided to try Microsoft office. I had never even executed Outlook and it stilled errored on the first try! All the other programs in the package opened with no problem. This was one of the hardest, not hardest, but close while doing this change in operating systems. Thanks Again Capt Jack

I tried with regedit. I deleted profiles and I still can't open Outlook. Help??

Did the regeidt and deleted the profile file. I knew there was a file I had to delete but could not think of it. But once I read your post I remebered the file. It worked great.

The Regedit part of this fixed the problem

Capt.Jack Sparrow said:

Hi Welcome to Seven Forum

Try this
Start-> type; outlook.exe /resetnavpane

Also an try this


Go to Start > Regedit

1. Locate HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem
2. Delete the Profiles key under the Windows Messaging (Subsystem) key.

Hope that Helps