Article ID: 2500318 - View products that this article applies to.
You use a Microsoft Entourage 2008 for Mac, Web Services Edition client to connect to a mailbox that is located on Small Business Server 2008 that is running Microsoft Exchange Server 2007. If Entourage for Mac sends a message that has an attachment that exceeds the send size limitation in Exchange 2007, you receive the following error message in Entourage for Mac:
An unknown error (-18493) has occurred. Your mailbox has exceeded the size limit. Account name: "Your_Username".
Note The e-mail message that is over the attachment size limit is moved to the Drafts folder. Every time that Entourage 2008 for Mac tries to perform a regular synchronization with Exchange 2007, Entourage for Mac crashes for several minutes when it tries to synchronize the Drafts folder. Additionally, lots of disk thrashing occurs on the Macintosh computer.
Entourage 2008 for Mac applies overhead when converting files from MAC platform to Windows platform. Allow 30% to 40% overhead when defining message attachments size limits.
Increasing the allowed attachment size may cause performance issues in the Exchange environment. You have to consider the increase load a large attachment puts on the server infrastructure. You may experience one or more of the following symptoms if the attachment size is increased:
The procedure to control attachment sizes for Entourage for Mac varies based on the version that you are using. The steps mentioned below applies to Microsoft Entourage 2008 for Mac, Web Services Edition. You have to make these changes on Exchange 2007 client access role server that Entourage 2008 for Mac client connects to, Which is your Small Business Server 2008 running Exchange 2007 client access server role.
Microsoft Entourage 2008 for Mac, Web Services Edition running in Small Business Server 2008 environment.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
(http://go.microsoft.com/fwlink/?LinkId=151500)for other considerations.