. The Exchange Server Enterprise CAL provides access to Unified Messaging and advanced compliance as well as Forefront Security for Exchange Server and Exchange Hosted Filtering for onsite and hosted antivirus and anti-spam protectionKey Product Info . Exchange Server offers built-in protective technologies to keep your business moving reduce spam and viruses enable confidential communications and help your company to be compliantWith Exchange Server employees get anywhere access to their e-mail voice mail calendars and contacts from a variety of clients and devicesExchange Server enables new levels of operational efficiency through capabilities that optimize hardware and networking investments and features that help make administrators more productive