With Exchange ActiveSync capabilities, it's easy to provide workers with mobile access to their email, contacts, calendar and even tasks without having to pay for additional software or services.
Get improved mobile e-mail capabilities, larger storage in Standard Edition, better protection from spam, enhanced security, advanced mailbox fundamentals, and more.
Exchange Unified Messaging provides an integrated inbox of e-mail, voicemail, and fax messages as well as access from any phone. This article from the Exchange Server Product Management team introduces this capability, which is under development for Exchange "12".