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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.

 

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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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