Outlook 2007 Error - Freezing upon start-up, extend.dat error.

  • Thread starter JOR2010
  • Start date Views 1,523


I have had Outlook 2007 installed for a few years, has been working fine all the time. I go back in today, just a few hours after it was all fine, and it tells me about an error involving extend.dat. I follow internet forums who tell me to rename it to extend.old, but it does nothing. I also run outlook.exe /resetnavpane, but it has the same effect, and does not help.

Every time I now enter Outlook, it freezes very quickly and does not respond almost straight away - before it was instantaneous.




You are using an OL data file created by 2007 or 2003 versions?

Running scanpst.exe does it find / correct err's in the data file?

And if you start OL using the safe switch, how does it behave?

Finally have you run a HD check?

Vinay - G

Did you try working in Outlook safe?

Try the following steps:

Click on Start > All Programs > Accessories > Run > Copy and Paste the following command in the open box and press Enter.

Outlook /safe

1. If Outlook safe works as expected, disable the add-ins for it using the following steps:

2. Click on File menu, click Options > Add-ins > Go button besides Manage: Com-in Add.

3. Check if there are add-ins listed, clear the checkbox to disable them.

4. Close the Office program and restart it.

5. Disable each add-in one at a time, restart the Outlook, and repeat the above procedure. If the issue reappears again, it will help you to determine which add-in is causing this issue.

Brian Tillman

Senior Member
When you encounter errors and would like assistance, it's best to include the full and exact text of the error message. Post it now.


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