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