[Samba] Act! 2000 WinXP RedHat 8.0 configuration problem

[P Hardy Tech, Inc.]

Hello,

I have 3 Windows XP SP1 desktops that need access to an ACT! 
2000 database on a Red Hat 8.0 server through Samba. The 
problem I'm having is that only one person can access the database 
at a time. 

All users are defined on the Linux system.

Can you please tell me what configuration is required to have all of 
my users access and modify the ACT database at once?

[ACT]
comment = ACT! database files
   path = /data/act
   valid users = joe tim sam
   public = no
   writable = yes
   printable = no
   force create mode = 0777
   oplocks = False
   level2oplocks = False


Thanks

Pat