XIMS: IMAP4 Implementation Violates Licensing (200604)


The information in this article applies to:

  • Microsoft Exchange Server 5.5
This article was previously published under Q200604

SYMPTOMS

Microsoft Exchange Server version 5.5 Internet Message Access Protocol, Version 4rev1 (IMAP4) clients can open more than one connection to an Exchange Server computer. Administrators who support a large IMAP4 community may face a licensing problem. Because the default licensing model for Exchange Server is on a one-seat connection for each session basis, users may be denied access.

CAUSE

Microsoft Outlook Express and non-Microsoft IMAP4 clients usually open a single session to send and receive mail. They may open additional sessions for specific operations such as folder manipulation.

WORKAROUND

Change the licensing mode for Exchange Server from per-server-concurrent-connections to per-seat-connections. You may need to purchase additional client access licenses (CALs).

MORE INFORMATION

For example, if the licensing mode for Exchange Server is set to per-server for 10 concurrent connections, and 5 Pine e-mail clients make a connection with 2 sessions for each connection, any other client that tries to connect is denied access because of the lack of available licenses.
Modification Type:MinorLast Reviewed:4/28/2005
Keywords:kbprb KB200604
©2004 Microsoft Corporation. All rights reserved.