Solution - Windows 2008 R2 Domain and GPO with Windows 8 clients

There was no big doing to fix the drive mapping for Windows 8 Clients when the Domain Controller is running on Windows 2008 R2.

What I have done?

1. I installed a Windows 2012 Server as Member Server
2. Add this server as Domain Controller (works perfect)
3. Managed the GPO on Windows 2012 and saved it

What exactly I have done?

1. Open GPMC on Windows 2012
2. Select the Mapping GPO (Example: Dom-Drive-Mapping)
3. Just select the GPO "Dom-Drive-Mapping" on the left panel
4. Select "STATUS" within the right panel
5. Next to the Domain Controller FQDN you will see the link "CHANGE"
6. Select new Baseline DC for the GPO and choose the Windows 2012 Server
7. Wait for replication (almost few seconds)
8. Doublecheck this with the button "Detect now" within the right buttom corner
9. Edit now the "Dom-Drive-Mapping" Policy
10. Double click one Drive Mapping (example: drive M - double click)
11. Keep the reconnect ticked. No need to untick it. If done, enable this.
12. Select on the Top Tab "COMMON"
13. Enable "Remove this item when..."
14. Select new Baseline DC for the GPO and choose an Windows 2008 Server - or leave it on 2012.
15. Done!

I have an item based drive mapping, which is based on group member ship. Don't know how you have done the settings. But now the drive mapping will work on Windows 8 and also on Windows 7.

Enjoy this!