Solution to Cannot Start Microsoft Office Outlook

Have you encountered 'Cannot Start Microsoft Office Outlook. Cannot Open the Outlook Window'. Don't delete your existing Outlook profiles just yet!

This has happened to three of my users in the last couple of months. This is caused by a Windows Update that modifies the navigation pane of Outlook 2007. So to revert back to your original settings before the issue happened follow below steps:

1. Click Start -> Run.
   
2. Type 'outlook.exe /resetnavpane'
   
3. Open Outlook 2007 again.
   

Viola, 'Cannot Start Microsoft Office Outlook. Cannot Open the Outlook Window' solved!

My other attempts, might be worth your try, are the following:

• Run Outlook in safemode of 'outlook.exe /safe'
  
• Delete Windows Updates relating to Outlook
  
• Delete Registry Key of Outlook Profiles
  

Test first the easiest solution attempt before deleting your Outlook profiles. It is will save you hours of downloading again your mails from your server.