ZCS Multi-Server Installation Guide 8.0
ZCS Multi-Server Installation Guide 8.0
Open Source Edition

Multiple-Server Installation > Defining Classes of Service

Defining Classes of Service
A default Class of Service (COS) is automatically created during the installation of Zimbra software. The COS controls mailbox quotas, message lifetime, password restrictions, attachment blocking and server pools. You can modify the default COS and create new COSs to assign to accounts according to your group management policies.
In an environment with multiple mailbox servers, COS is used to assign the new accounts to a mailbox server. The COS server pool page lists the mailbox servers in your Zimbra environment. When you configure the COS, select which servers to add to the server pool. Within each pool of servers, a random algorithm assigns new mailboxes to any available server.
To create or modify a COS, from the administration console, click COS. If you have questions, refer to the Help.
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