I've done it succesfully on Solaris, never managed to get it to work on Windows.
The answer for your customer is that it may not work.
Try it - it if works you are in luck, if not, then there is nothing that can be done (even by Symantec) - there are not tuning parameters of settings that will change the outcome, it either works, or it doesn't (which is why it is listed as 'unsupported').
If the backups are multiplexed, it won't work at all.
Martin
