Another one of Microsoft's annoyances.
When running users on network homes, users are having issues saving from Microsoft office applications getting such errors as "Word cannot save file because it is already open elsewhere" when there is no other copy open.
The cause of this appears to be the weird way that Microsoft saves files. Rather than saving directly to the directory you specify, it first saves it to the .TemporaryItems folder in the root of the share that the users home directory is located.That means that if the home directory is on /volumes/userRAID/users/fredbloggs and the share is /volumes/userRAID/users then the temporary directory is /volumes/userRAID/
Therefore all users need to have write access to this directory, even though it is a few tiers up the folder tree than the user has access to.
Took me ages to find out that one :o/