I've scanned this group for posts regarding cached exchange mode and
OST files, but haven't found the information I need.

I need to know the impact of re-enabling cached exchange mode and NOT
removing any old OST files.

Scenario:
User works with Outlook (2003 or 2007) in cached exchange mode for a
period of time. Then, for whatever reason, cached exchange mode is
disabled.

The OST file is NOT deleted or renamed.

After some time (months maybe), cached exchange mode is turned back
ON. The user's profile in Outlook has not changed, nor has there been
any change on the Exchange 2003 server regarding the mailbox settings.

What happens with regard to the OST file? Does Outlook use the old OST
file and tries to sync it with the mailbox, possibly putting old items
stored in the OST file back into the mailbox? Or will Outlook create a
new PST file?

Thanks in advance.

-RAM