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Discussion Starter · #1 ·
Hi All,
Just been reading the Outlook Contacts thread and it reminded me that I have a long outstanding query someone could maybe clear up.

I backup my .pst file with my regular backups, in my case it's in my Outlook flr.

But what is the Extend.dat file that's there also?

thanks
Hew

Later: this is what I found:
The Extend.dat file is a binary file that caches registry entries for third-party product extensions.

More important, it doesn't need to be backed up because if you rename or delete it, it will be recreated the next time Outlook starts.

I'll leave this thread here in case anybody else searches for Extend.Dat

Hew
 
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