I have a GPO that maps drives. That's under User Configuration and is linked to an OU that contains users only.

When logging on to desktop/laptops this GPO is applied correctly.

When logging on to a VMware View desktop the drives aren't mapped. GPResults shows the GPO is applied (on the Summary tab) but on the Settings tab there is nothing listed under the user configuration.

I don't see how the View desktop should matter as it's a user configuration setting not a computer one.

Any ideas why it says it's been applied but it doesn't take effect?

Enabled debugging (http://support.microsoft.com/kb/221833/en-us), output shows the (edited) following:

USERENV(294.3b0) 11:46:56:843 EvaluateDeferredGPOs:  Searching for GPOs in cn=policies,cn=system,DC=domain,DC=local
USERENV(294.3b0) 11:46:56:843 ProcessGPO:  ==============================
USERENV(294.3b0) 11:46:56:843 ProcessGPO:  Searching <cn={A1FD75CC-533C-4946-BC41-804E4EC64313},cn=policies,cn=system,DC=domain,DC=local>
USERENV(294.3b0) 11:46:56:843 ProcessGPO:  User has access to this GPO.
USERENV(294.3b0) 11:46:56:843 ProcessGPO:  GPO passes the filter check.
USERENV(294.3b0) 11:46:56:843 ProcessGPO:  Found functionality version of:  2
USERENV(294.3b0) 11:46:56:859 ProcessGPO:  Found file system path of:  <\\domain.local\SysVol\domain.local\Policies\{A1FD75CC-533C-4946-BC41-804E4EC64313}>
USERENV(294.3b0) 11:46:56:875 ProcessGPO:  Found common name of:  <{A1FD75CC-533C-4946-BC41-804E4EC64313}>
USERENV(294.3b0) 11:46:56:875 ProcessGPO:  Found display name of:  <_W7IB Drive Mapping Staff Only>
USERENV(294.3b0) 11:46:56:875 ProcessGPO:  Found user version of:  GPC is 24, GPT is 24
USERENV(294.3b0) 11:46:56:875 ProcessGPO:  Found flags of:  2
USERENV(294.3b0) 11:46:56:875 ProcessGPO:  Found extensions:  [{00000000-0000-0000-0000-000000000000}{2EA1A81B-48E5-45E9-8BB7-A6E3AC170006}][{5794DAFD-BE60-433F-88A2-1A31939AC01F}{2EA1A81B-48E5-45E9-8BB7-A6E3AC170006}]
USERENV(294.3b0) 11:46:56:875 ProcessGPO:  ==============================
USERENV(294.3b0) 11:46:56:875 GetGPOInfo:  Local GPO's gpt.ini is not accessible, assuming default state.
USERENV(294.3b0) 11:46:56:875 GetGPOInfo:  Leaving with 1
USERENV(294.3b0) 11:46:56:875 GetGPOInfo:  ********************************
USERENV(294.3b0) 11:46:56:875 ProcessGPOs: Logging Data for Target <spm2>.
USERENV(294.3b0) 11:46:56:875 GetWbemServices: CoCreateInstance succeeded
USERENV(294.3b0) 11:46:56:890 ConnectToNameSpace: ConnectServer returned 0x0

Doesn't really show much that I can see. It all looks like it's being applied.

Fixed. The VMware View XP desktops did not have Group Policy Preference Client Side Extensions for Windows XP (KB943729) installed. Downloaded from http://www.microsoft.com/en-us/download/details.aspx?id=3628, installed, ran gpupdate, logged off/on and the drives mapped perfectly.