OES11 SP2.
NSS volumes with CIFS enabled.
In the server config for CIFS, there's a WINS server setting.

Does OES11 SP2 CIFS actually *use* and/or *require* WINS?

The docs don't state any of this.

Basically we need to retire our Windows 2003 servers which means our WINS servers have to go bye-bye.

From a client to server perspective, it seems anyway, that WINS isn't required if the CIFS "server" name is in DNS.