duplicate files in data/

I'm cleaning up an inherited squirrelmail.

For a few dozen users, I find in the data/ directory, different file sets for same user:

1. user.pref, user.abook, user.sig

2. user@..., etc

3. USER.pref, etc

... depending on how he user logs in.

Before converting with flat2sql.pl, how do I limit login+files to only, eg, user@... ?

We've had several instance of user complaints of "losing my address book" when the user had only logged in differently and sm created different set of files.

Thanks
Len


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