Microsoft KB Archive/200604

= XIMS: IMAP4 Implementation Violates Licensing =

Article ID: 200604

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition

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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.

Keywords: kbprb KB200604

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