I have searched far and wide for guidance on creating accounts in Exchange
2003/Windows 2003 to be used for Resource Mailboxes but I keep coming up
empty.

I have about a dozen Resource accounts that I created under Exchange
5.5/Windows 2000 that migrated over just fine as Disabled/Mailbox enabled
accounts, but now I need to create additional ones.

Specifically I am concerned about the proper Permissions settings under
Mailbox Rights. My migrated accounts have an extensive list of Allow and
Deny Permissions that is shows to be "Inherited From Parent Object," but
there is no longer a "Parent" that I can discern that these are being
inherited from. When I create new accounts (even if I use the Copy option)
the only permission created for Mailbox Rights is for "SELF" giving it Read
and Full Mailbox Access. (and no, there is no checkbox to inherit permission
like in NTFS perms)