JohnDoody,
You won't like the answer that I'm about to give, but it is the ONLY answer that can be given:
"Excel does not handle 'Shared' workbooks reliably. They are often corrupted at random and apparently without cause. Clearly there is a cause but it has not yet been isolated and fixed by MS. There is nothing you can do to avoid shared workbooks corrupting. The ONLY thing that can be done is to make them single user.
To help you with the single user file system try adopting this approach instead. It does work rather well so it's worth doing. First make the file(s) single user. Second edit everyone's user profile in Excel - Tools/Options/General/UserName and in there put the person's name and telephone extension number. Then whenever you attempt to open a file that someone else is using, a dialogue box will pop-up telling you who is the current user - and it tells you their telephone extension number! The new user can opt to either call the current user or open the file as read-only.
I realise it seems odd that MS would have an unreliable feature in Excel but I'm afraid that's the way it is. If you must have simultaneous access then it would be wise to use a proper database.
For Office 2007: Office Button > Excel Options >Popular tab >User name"
Patrick
