VMWare server does not appear to retain the security information you put in when you created the datastore once it is restarted.
I ahve seen this issue since day one and I don't know that there is any solution. A HUGE pain.
Thank you for the answer; do you know if this VMware Serever bug is restricted to this combination of OSs (Windows 7 as Host and Windows Server 2008 as NAS) or it is applicable to all SOs?
This applies to all OS as far as I know. The VMWare server 2.x just does not retain the security attributes for authenticated access to CIFS shares underlying any network based data stores you define.
I have see some information that this actually worked in version 1.x server, but I can't confirm that.
I am not sure if this is a bug or by design since this behaviour has persisted through several 2.x releases, it may be by design to drive users to the commercial versions.