[dev] Fix typo
[dev] New ExchangeServerSelector to list all available Exchange servers
[dev] New MailboxStoreSelector to list all available mailbox databases
[dev] New TransferAgentSelector to list all MTAs

The Message Transfer Agent is only needed for x.400 messaging and,
thus, might not be necessary in the future.
[dev] New AddressListSelector to list all address lists defined in Exchange & to get the default global address list
[dev] Fix whitespace
[dev] New RecipientTypeDetails enumeration
[dev] New RecipientDisplayType enumeration