Hello,

The only other forums that could help would be the Windows SharePoint
Services forum or Microsoft Office Sharepoint Server forums, because I think
the solution isn't InfoPath-specific.

There are two ways I can think of - using a SharePoint policy, or a custom
app.

Using Sharepoint Policies you can create a workflow using (for example) the
SharePoint designer that would move a form to a specific location.  You can
then set up "Information Management Policy Settings" (it's in the form
library settings area) to use this workflow and set up an expirate date for
your forms.

The other way would be to create a custom (for example) .NET app that would
iterate through the forms on a scheduled time and manually move all the old
forms using the SharePoint API.

HTH

Gavin.