First, Zarafa (http://zarafa.com/), which is an Exchange Clone, also supports that feature via Webmail.
Second, if it's a problem that a device gets deleted, a clearing talk between the user, IT and management will surely help to find a clear position whether it's to be done or not.
I really like remote wipe, and used it when I recently changed my phone to a new model. No more "what else do I have to delete", just wipe it and everything is gone. Very nice feature also in case it gets deleted.