[AccessD] AccessXP and Server 2003

Has anyone had any problems with users being able to open a .mdb after
moving the database to Windows Server 2003?  I have set the permissions for
both the folders and the database for full control individually for each of
the 5 users involved.  Three are able to use the database but two can't.
Unless I missed an intermediate step each user was set up exactly the same
way.  

Using my VB6 application the error is "Could not use "; file in use".
Opening with AccessXP "Could not lock file"


The database was on a NT 4.0 server before and there was no problem in the
connection being made and multiple users were no problem.

The resident drive was mapped on the NT box and is mapped the same way on
the 2003 box.

Any suggestions are welcomed.

Perry Harold