MailEnable Enterprise Guide
Services and Connectors / XMPP Service / XMPP - Roster
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    XMPP - Roster
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    The XMPP roster is the contact list for a mailbox. These contacts are the ones shown in the XMPP client application. By default the server will populate the roster with all the other mailboxes under the post office. This can affect the performance of webmail or clients if you have a large number of mailboxes, as presence information needs to be sent and received for every mailbox shown. So the XMPP service is able to limit the number and only show those mailboxes who have been invited and added to the personal roster.