We have a situation where multiple users access shared excel workbooks over
an open network share. Sporadically, these files become locked and
thereafter no one can access them. Usually the files 'unlock' after a day or
two on their own.

The files get locked randomly by various users, files range in size from
500K to 20MB, office 2003 in a windows domain.

If anyone has any idea as to the cause of this one and a remedy, we'd
greatly appreciate it.