Recipients:
Link: http://technet.microsoft.com/en-us/library/bb201680.aspx
Exchange Mailbox Types/Convert with EMS:
Regular
Room
Equipment
Type
Link: http://technet.microsoft.com/en-us/library/bb201749(v=exchg.141).aspx
Configuring a Resource Mailbox (2010):
http://www.msexchange.org/articles-tutorials/exchange-server-2010/management-administration/resource-mailboxes-exchange-2010-part1.html
Role Based Access Control:
http://technet.microsoft.com/en-us/library/dd298183(v=exchg.150).aspx