Some time offline address book doesn’t show recent changes we made to the exchange server. To update exchange offline: Syntax : Update-OfflineAddressBook -Identity <OfflineAddressBookIdParameter> [-Confirm [<SwitchParameter>]] [-DomainController <Fqdn>] [-Force <SwitchParameter>]
Category: Microsoft Exchange 2013
How to Send mail from an additional Exchange address or aliasHow to Send mail from an additional Exchange address or alias
Until Outlook 2013 you can have only one exchange account on your outlook profile there for the only way to add different “From” address is by adding additional POP3/IMAP account