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Hello, Experts. As I look through our Exchange Server 5.5 stand.'s events log, I found this log from Application event, <br />
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Event Type: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Error<br />
Event Source: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MSExchange IMAP4 Interface<br />
Event Category: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Authentication <br />
Event ID: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;13004<br />
Date: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2/28/2007<br />
Time: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4:19:33 PM<br />
User: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;N/A<br />
Computer: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LAEXCHANGE<br />
Description:<br />
Logon attempt from 10.1.3.95 has failed: AcceptSecurityContext() call failed with error Access denied. <br />
<br />
It records every 10 minutes basis on Exchange Server's event viewer, but the user (10.1.3.95) has no problem to send or receive emails at all. <br />
And I can't find any informations to troubleshoot except article KB220905 but that article was for different case. The client (10.1.3.95) using Macintosh OSX 10.4.6 and Entourage for his Mail application. We have other users whose using Macintosh Mail program (IMAP) but haven't seen any errors except that one.<br />
Any help will be appreciated. Thank you. <br />
<br />

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Hello, Experts. As I look through our Exchange Server 5.5 stand.'s events log, I found this log from Application event, 

Event Type:	Error
Event Source:	MSExchange IMAP4 Interface
Event Category:	Authentication 
Event ID:	13004
Date:		2/28/2007
Time:		4:19:33 PM
User:		N/A
Computer:	LAEXCHANGE
Description:
Logon attempt from 10.1.3.95 has failed: AcceptSecurityContext() call failed with error Access denied. 

It records every 10 minutes basis on Exchange Server's event viewer, but the user (10.1.3.95) has no problem to send or receive emails at all. 
And I can't find any informations to troubleshoot except article KB220905 but that article was for different case. The client (10.1.3.95) using Macintosh OSX 10.4.6 and Entourage for his Mail application. We have other users whose using Macintosh Mail program (IMAP) but haven't seen any errors except that one.
Any help will be appreciated. Thank you. 



Exchange 5.5 Application Error log. MSExchange IMAP4

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.

Email Clients

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.