Good morning says my computer with the following error message:

After launching outlook - I got the following error message:

• Your offline file cannot be configured.
• 
• Followed by an additional error complaining about my ost file being missing.
• Then I'm prompted with a form asking me to locate my .pst file.
• The odd thing about this error is that I can compose an email, but when i go to send it, the email never leaves my outbox.

Apparently here is what the issue was. This weekend we had a change control to update several citrix servers from Office 2003 to Office 2007. And since these servers were located in a restricted area, I had to stage the install files on a home share. And since there are limits on utilization in the home share space, I basically had to dump my pst files and outlook ost files and place them somewhere else. My intention was to complete the installs, remove the staged install directory and relocate the pst/ost files. Apparently office had some other ideas.

As I was moving the pst/ost files from my home share to the local drive noticed, i was unable to relocate my .ost file. I figured outlook or exchange had a handle on the file somewhere so I went to my primary box and closed Outlook 2007. I then tried to move file again but was denied. After that last error, I moved on to my other tasks.

Probably not the best fix, but here is how I corrected the issue. Note: this error was completely annoying.

1. Open Control Panel (start > run > type in "control" and hit enter)
2. Under "adjust your computers settings" and open "Mail (32-bit)
3. Under Mail Setup - Outlook > select E-mail accounts...
   • 
4. Under the "e-mail" tab look for "Microsoft Exchange" and click on the remove button.
   • Note: this task cannot be done from within the outlook IDE.
5. Under the "data files" tab remove any pst files if possible.
6. Open the registry and purge the following HKCU keys:
   • HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook
   • HKEY_CURRENT_USER\Software\Microsoft\Office\8.0\Outlook (if exists)
   • HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook
7. reboot the pc and log back in
8. Open Control Panel (start > run > type in "control" and hit enter)
9. Under "adjust your computers settings" and open "Mail (32-bit)
10. Under Mail Setup - Outlook > select E-mail accounts...
11. under the "e-mail" tab reconfigure your exchange account
    • click on "new"
    • click on "microsoft exchange, pop3, imap, or http" option and click on next
    • don't worry about keying in the auto account setup information if you are a lan with exchange.
    • click on "manually configure server settings or additional server types" and select next
    • 
    • now click on "microsoft exchange" and select next
    • key in any exchange server
    • then click on the "use cached exchange mode" option
    • key in your last name, first name and click check name to locate your acount
    • click next to finish up the configuration.
12. open outlook and send off a test email to yourself
13. if you see some your note in your inbox than you have successfully fixed the issue.

Oddly enough, the above probably is not the most exquisite way to fix your cached exchange mode explosion, and never explains what happened to your old ost file to become corrupt. Nor does it explain how to get back your old inbox data. Simply stated, the above fix will get you back in working order fairly quickly.