Ressler said Exchange 12 will bring with it better and enhanced control and productivity for IT administrators, expanded inbox access for end users, and increased security and compliance for organizations. "One of the biggest changes in Exchange 12 is that the architecture is based on five server roles, which componentizes or modularizes Exchange and thereby allows an administrator to choose which of those he wants to install per server. Some of these roles, like for unified messaging and edge transport, are optional, while the others, like client access, are mandatory," he told eWEEK.
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News source: eWeek