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Exchange 2010 Overview
Now, more than ever, your customer’s organization requires cost-effective and flexible communication tools. With Microsoft Exchange Server 2010 your customer can achieve new levels of reliability and performance with features that simplify their administration, help protect communications, and delight users by meeting their demands for greater mobility.

Microsoft Exchange Server, the cornerstone of Microsoft’s Unified Communications solution, is a flexible and reliable messaging platform that can help lower messaging costs by 50-80%, increase productivity with anywhere access to business communications, and safeguard businesses with protection and compliance capabilities that help manage risk.

License Exchange 2010
Exchange Server 2010 on-premises is licensed in the Server / Client Access License (CAL) model in exactly the same way that Exchange Server 2007 was licensed. There are three types of licenses:

Server
A license must be assigned for each instance of the server software that is being run. The Exchange Server license is sold in two server editions:

• Standard Edition: designed for the mailbox needs of small to medium organizations.
  Also appropriate for non-mailbox roles in a larger Exchange deployment.
• Enterprise Edition: designed for larger organizations that may require a greater number
  of mailbox databases.

 
 
Client Access Licenses (CALs)
Exchange requires a CAL for each user or device that accesses the server software. There are two types of CALs for Exchange:

• Standard CAL: designed to help users be more productive from virtually any platform, browser,
  or mobile device, with new features in Exchange Server 2010 that help manage communications
  overload and lower helpdesk costs.
• Enterprise CAL: designed to allow organizations to reduce the costs and complexity of meeting
  compliance requirements with new integrated archiving functionality and information protection
  capabilities, while also helping you cut costs by replacing legacy voice mail systems with
  Unified Messaging.

The Enterprise CAL is sold as an add-on to the Standard CAL. To enable Standard CAL features for a user, the user must be licensed with just the Standard CAL. To enable Enterprise CAL features, the user must be licensed with one Standard CAL plus one Enterprise CAL.
Note: Both CALs work with either Server Edition.

External Connector Licenses
An External Connector permits an unlimited number of clients to access an Exchange Server in scenarios where the number of CALs is uncertain.

• Access via the External Connector is limited to non-employees such as partners, suppliers,
  customers, and retirees.
• The number of External Connector licenses required corresponds to the number of servers in
  the organization’s Exchange environment.

For further information on Exchange licensing please
click here

For further information on the different editions of Exchange 2010 please
click here