The next version of the Microsoft Exchange e-mail server will cost businesses more to implement if they want to take advantage of new features.
Exchange Server 2007 will be equipped with new unified messaging and anti-virus features, among other improvements, but these will all cost more to implement, Microsoft has confirmed.
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Businesses will have to pay a higher amount for each PC that connects to the server, otherwise known as the client access license (CAL).
Firms that just want the core calendar, contacts and e-mail features will be offered a standard CAL, at the same price as current CALs covering the existing Exchange 2003 platform.
Microsoft has not revealed how much extra firms would pay to get the extra functionality and security features, but it said the extra amount would be less than if such tools were bought separately.
The first beta of Exchange 2007 (previously known as Exchange 12) was released last December. A second beta is planned for later this summer.
Microsoft is aiming to have the product ready for commercial release by early 2007.