Outlook 2010 will not open

Question

I have Microsoft Office Professional Plus 2010. I've had issues with a problem in outlook where file was being generated in my PST folders everytime I opened outlook. I read where I should disable Norton Anti-Spam and it worked to allow me to delete the
folders and not get any new ones. I thought I should try uninstalling MS Office and reloading it. I used the Control Panel to remove the program but it only partially removed Office and stopped. I then used FixIt and removed more of Office and got most of
it but it stopped at the end too. I could not totally remove whatever remained of office but it looked like it was all gone. I also have Visio 2010 and Project 2010 and did not attempt removing those yet. When I tried to re-install office I got an error about
legacy groove SW that needed to be removed first. I couldn't find a way to do it. I then read I could do a custom install and install everything in office except SharePoint Workspace. I did that and it seemed to work.  Everything worked except Outlook.
So then I added features to the suite by custom install of SharePoint Workspace only. All seemed to work. But Outlook still will not open. I get an error that states: Cannot open your default email folders. An unexpected error has occurred. MAPI was unable
to load the information service mspst.dll. Be sure the service is correctly installed and configured. I have Windows 7 Home Premium.  What should I do?

Answer 1

Hi,
Go to C:\Windows\System32 and double click on Fixmapi.exe, it won't give you any message, just reboot computer and try again.
If this issue persists, create a new profile in Control Panel -> Mail to check the result:
http://support.microsoft.com/kb/829918/en-us
If this issue still persists, we need to uninstall Office completely, then re-install it.
Once you finished uninstalling Office, please also delete the following registry keys:
Important
This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the
registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry,
http://windows.microsoft.com/en-US/windows7/Back-up-the-registry
HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook
HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook
HKEY_LOCAL_MACHINE\Software\Microsoft\Office\14.0\Outlook
HKEY_LOCAL_MACHINE\Software\Microsoft\Office\Outlook
Once the keys are deleted restart the computer and re-install Office, check if Outlook works fine.
Regards,
Melon Chen
TechNet Community Support