My users can't save my spreadsheet

[rkjudy]

I am the author of a pretty complex workbook that I modify from time to time and distribute to about 10 users. I distribute the updated (modified) workbook by email. The user just downloads the new modified version of the workbook and saves it where the old version was. This way, they always have the latest version of the workbook. For the last couple of years, I've been using Excel 2003. Recently, I though I'd try Office 2010. I upgraded to Office 2010 (keeping 2003 installed), played around with my workbook in Excel 2010 and decided I really didn't like it. I uninstalled Excel 2010 and went back to 2003. The problem I'm having is that now my users can't save the file when I send them an update. They just get a message that says "Can't save file". I'm not doing anything different. Some of my users are even using the same version of Excel, 2003. It may be important to tell you that I probably did save the file at least once in Excel 2010, but when I went back to 2003, I had no problems opening the file and have had no problem opening or saving since. Any help would be appreciated.

[Maistrye]

As to the actual issue, I'm not certain. I can only ask a couple random questions.

1. How do they save the file? Do they export it directly from their Email into the folder it belongs in? Do they open the file in Excel from the Email, then save it to the old location through Excel?

2. Further to (1), which program (Excel, or which Email program) is saying "Can't save file."?

3. Can they save it as a new file (that is, don't overwrite the old version, but save it separately)?

That's all the random questions I can think of at the moment.

S

[rkjudy]

We've tried saving every way possible but nothing works. Some users get "Can't save file" error, others get "Document not saved" error. I just don't know what to do.