Possible to Enumerate HKEY_USERS ??

[country73]

We are currently upgrading our Exchange server from 5.5 to 2003; for about 150 individuals that connect via Citrix, the decision has been made for their Outlook profiles to be deleted so that they will be forced to recreate their profiles.
Is there any way to Enumarate all of the keys in HKEY_USERS so that I can work with just the keys that start with S-1-5-21?
The information that I am trying to clear out resides in:
HKEY_USERS\S-1-5-21-<various keys>\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\<Delete all entries in here>

 

[country73]

Found a solution; I'm going to first enumarate the registry keys in: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList
From there I can grab each key that begins with S-1-5-21 and then use that to take care of the HKEY_USERS\S-1-5-21-...