try a new profile. or you can try deleting extend.dat, outcmd.dat, views.dat
and frmcache first.

--
Diane Poremsky [MVP - Outlook]
Author, Teach Yourself Outlook 2003 in 24 Hours
Need Help with Common Tasks? http://www.outlook-tips.net/beginner/
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"Rainer" wrote in message
...
I upgraded Outolook from 2003 to 2007.

After lauching Outlook, a little screen opens, showing that Outlook is
migrating accounts and archives. Suddenly Outlook closes down and an error
message appears showing:

Not able to start Microsoft Office Outlook. Not able to open window of
Outlook. Not able to open this group of files. The attempt of starting a
session in Microsoft Exchange has failed.

Should I reinstall the application?