I have a long time experience with supporting and building world wide distributed AD networks
(about 30 offices around the world with several Datacenters)
with a tons of MS windows servers and clients(Windows, Linux, AIX, Solaris).
Troubleshooting of all MS core services (DNS, AD, CA, NPS, GPO, Print servers, DHCP, WSUS etc...).
I can provide fast and qualitatively support of any problems that can happen.
Several questions:
1. Why GPO doesn't help here?
2. Which model of Drobo NAS d you have?
3. All users need to map same share?