Cost of using Active Directory Authentication

[furfoot]

We're looking to provide 10.000 new users with a zimbra mailbox (new zimbra NE installation) in our MS IT environment. This environment is currently using Active Directory for its user provisioning and authentication.

We will have to provision 10.000 new accounts in a user directory. These users will only be connecting to our Zimbra installation (6x REL servers). If we were to use AD for the authentication of these new accounts would this require a server/device/user CAL from microsoft?

[LMStone]

Authentication to AD is a use which generates a CAL requirement. If you already have 10K user CALs, just adding a Zimbra farm will not trigger any additional CAL purchase requirements.

If the 10K new users are the result of, say, a merger or an acquisition, then yes, you'll need additional Microsoft licensing.

Hope that helps,
Mark