I can open and save the Excel file if I use a mapped drive path, but not if i open it using the full path.

e:\sales\file.xls works fine, open, saves, re-opens.
\\server\sales\file.xls opens, saves and is then its corrupt.

I've experimented with this and its a consistent problem on 3 computers with various excel (2002, 2003 Small Buisness, 2003 Standard) versions and xp service packs (SP1, SP2, SP3). I also tried differnet opening methods, double click on the file vs excel>file>open>browse... and the only consistancy seems to be the path name. Has any one ever heard of anything like this?

To add a bit more info, this file starts as a template and our off site salesmen fill it out and e-mail it in. The problem only occurrs with files from one of our 8 salesmen. We've re-installed MS Office and updated all his software, but the problem presists.