MICROSOFT EXCHANGE SERVER 2010 DEVICE CAL

Each user or device accessing the Exchange Server requires an access license (CAL). The CALs is available in the variants User CAL (for access of a licensed user) and Device CAL (for access of a licensed device). With the corresponding CAL the user (User CAL)/device (Device CAL) can access all Exchange Server within the domain. The functionality of the Exchange server is determined by the type of CAL.

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Microsoft Exchange Server 2010 DEVICE CAL

Each user or device accessing the Exchange Server requires an access license (CAL). The CALs are available in the variants User CAL (for access by a licensed user) and Device CAL (for access by a licensed device). With the corresponding CAL, the user (User CAL)/device (Device CAL) can access all Exchange servers within the domain. The functionality of the Exchange server is determined by the type of CAL.

product info,

Name: Microsoft Exchange Server 2010 DEVICE CALGroup
: Software - Server 
Category: Full Version - License - Volume License

General information,

Language: multi languageNumber of
licenses: 1x CAL (access license) - Volume license

Microsoft Exchange Server Device CAL 2010 Standard

The Microsoft Exchange Server Device CAL 2010 Standard is the client-based license for accessing the Microsoft Exchange Server. 
With the device CAL you purchase a CAL for a user who can access the server software to use its services. The device CAL is completely independent of the device used for access.