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March 20th, 2018 07:00

Outlook 2007. Error opening extend file.dat

Moved the file .pst from one computer to another, then Outlook stopped turning off, - when you click the exit button in the tray icon becomes black and white and does not disappear, when you try to start Outlook message POPs out: Failed to initialize the extension. Could not open the extend file.dat. It probably doesn't exist, you don't have permission to open it, or it's open in another program...How can I fix this problem?
Originally tried to import the data using the standard Outlook (File - Import and export), but this method does not copy the address book, fly settings, etc. In the end I decided to just copy the pst file entirely.

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March 20th, 2018 10:00

Check the properties of the PST file.  May have a notice that this file came from another computer.  If it does there is an option to allow or use the file (don't remember exact wording).

That is one possibility.

 

March 30th, 2018 08:00

good day !! faced recently with a similar problem, the fastest way to solve this problem turned out to be outlook repair tool - http://www.microsoftoutlook.repair/online/

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