Exchange 2007 ADD Powershell CmdLets

• Add- AD Permission – Used to add permissions to an Active Directory directory service object.
• Add-AvailabilityAddressSpace – Used to define the access method and associated credentials that are used to exchange free/busy data across forests.
• Add-ContentFilterPhrase – Used to define custom words for the Content Filter agent
• Add-DistributionGroupMember – Used to add a user recipient to a email distribution group
• Add-ExchangeAdministrator – Is used to add a user or group to a particular Microsoft Exchange Server 2007 administrator to one of the following roles “OrgAdmin | RecipientAdmin | ServerAdmin | ViewOnlyAdmin | PublicFolderAdmin”
• Add-IPAllowListEntry – Used to add an IP or range of IP’s to the IP Allow list for the Connection Filter agent on a on the Hub or Edge server role.
• Add-IPAllowListProvider – Used for creation of  a new IP Allow List provider on Edge Transport or HUB  server role .
• Add-IPBlockListEntry – Used to block an IP or range of IP’s to the IP Allow list for the Connection Filter agent on a on the Hub or Edge server role.
• Add-IPBlockListProvider – Used for creation of a Deny  IP List on Edge Transport or HUB  server role .
• Add-MailboxPermission – Command is used for adding permissions to a specific mailbox
• Add-PublicFolderAdministrativePermission – Is used to add administrative permissions to a public folder.
• Add-PublicFolderClientPermission – Is used to assign permissions to users on public folders.

Read more at http://technet.microsoft.com/en-us/library/bb124413.aspx