Sometimes, it may be handy to know how many CALs in Exchange are now actually in use. In Exchange 2010 and 2013, this can be done very easily.

There are two types of Exchange CALs: Standard and Enterprise. For the majority, the CALs provide the same feature, accept for Enterprise, which has the following additional features:

Mailbox archiving

Per-mailbox journaling

Unified Messaging

If a mailbox uses any of these "enterprise" features, then it is treated as an Enterprise CAL. If not, it is a Standard CAL.

License compliancy
This process "calculates" the current required CALs, not the CALs you have purchased. It's up to you to determine whether you are compliant.

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