We are using session variables to track users as they access documents
available on our website. We recently switched from Windows NT 4.0 and IIS 4.0
and ColdFusion 4.x to Windows 2003 IIS 6.0 and ColdFusion MX. After the switch
the following problem started to occure.

1) User logs in, session variables are set.
2) User access list of documents (session variables OK).
3) User Clicks Acrobat document (Session Variables OK).
4) Acrobat plugin is loaded into their browser and the document is displayed
(Session Variables OK).
5) User clicks Back Button (Session Variables OK).
6) User click on Microsoft Office Word Document. (Session Variables OK).
7) Dialog box pops up and asks the user to select OPEN or SAVE. They select
OPEN. (Session Variables OK)
8) Microsoft Office Word Plugin is loaded into browser and document is
displayed (Session Variable status Questionable Can't see them in debug).
9) User click Back button, list of documents is displayed, (session Variables
are there, but might be cached page).
10) User clicks another page or refresh and session variables are all lost.
New CF ID is generated.

This only occures with Word or PowerPoint. Did not occure if the user saves
the document and view with full applications. Does not happen in Netscape. And
does not happen on old server.

Any ideas?