In the search results, right-click on each extend.dat that’s found and select “Rename” from the pop-up menu change the name to extend.old.

Click “Search” or “Find Now” let the search run until it’s finished.

Be sure to select “Include Subfolders” this may be under the “Advanced” option.

In the “Look In” list, make sure your local hard drives are selected.

In the “Named” or “All or Part of the File Name” box, type extend.dat.

In the search options, select “All Files and Folders”.

Click the Windows “Start” menu and select the “Find” or “Search” option.

To rebuild your “extend.dat” file, do the following: IMPORTANT: This is normally a safe operation, but you should still make sure you have your Outlook PST file backed up before you try it. The solution is to force Outlook to rebuild the “extend.dat” file, which is fairly easy to do. One reported problem is a corrupt Outlook “extend.dat” file. You can then go back and start re-enabling the add-ins one by one until you find the one that’s causing problems.

De-select all of the add-ins and click OK.

Near the bottom of the window, you’ll see a Manage option set it to COM Add-Ins and click Go.

Disabling your add-ins will get things working again: In particular, we’ve found that Evernote’s add-ins will cause this problem. Often, an add-in is to blame for locking the message. Then if you need to extract an attachment or reply to the email, you can still open it in Outlook. This is all that you need most of the time. The previewer gives a faithful view of the email message without opening it. The simplest solution is to use FileCenter’s Professional’s “Preview” button instead of opening the MSG file. Any number of things could be causing the problem. Normally Outlook should release the message as soon as you close it.

This only happens if Outlook is running, and it goes away if you close Outlook. The file may not exist, you may not have permission to open it, or it may be open in another program. It’s possible the file is already open, or you don’t have permission to open it …Ĭan’t open file.

When you try to re-open the MSG file, you get an error message that says, in part: If you open then close the file, you can’t re-open it, rename it, or delete it in FileCenter. You’ve saved an Outlook email as an MSG file.

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