I have a user on our network who is having problems with a shared excel
workbook. He can open it with no problem, but when he tries to save it, it
notifies him that it is locked and he won't be able to save the file. If I
click on Tools > Share Workbook... there is a weird user name in the box.
It lists his username and a user that has the name of ?? (two boxes), or a
username that is made up of weird characters.

Does anyone know what is going on?

Thanks,
Drew Laing