An extension failed to initialize. Can’t open file: extend.dat The file may not exist, you may not have permission to open it, or it may be open in another program


Solution that worked for me:
Close Microsoft Outlook
Open Windows Explorer and open the following folders:
Documents and Settings
User profile that has the issue
Local Settings
Application Data
Microsoft
Outlook

Delete the file called extend.dat

Re-open Microsoft Outlook
It should list the Out of Office Assistant on the Tools Menu

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One Response to “An extension failed to initialize. Can’t open file: extend.dat The file may not exist, you may not have permission to open it, or it may be open in another program”

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