I have two pst archive file linked and non of them show up in the registry (besides in MRU lists) so I do not think that that is an option.

PST’s are in a default location (C:\Documents and Settings\usernamegoeshere\Local Settings\Application Data\Microsoft\Outlook if I'm correct) but anyone can put one anywhere he/she likes.

Doing a search on .pst files is the most effective and maybe even the only way to get them all.
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Mart

- Chuck Norris once sold ebay to ebay on ebay.