If this is your default archive .pst file, you should be able to find its location in Tools | Options | Other Options | AutoArchive. If not, start asking.

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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
>I think my archived sent folder was on my companies server and I should
> have not but I closed it (I used help to find it... so I thought it
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> So guess I'll wait for the tech guy to tell me it's lost... or...?
> Where is the "closed" outlook archived sent folder? thanks