How to allow Entourage for Mac to send large e-mail messages to an Exchange 2007 server

The procedure to control attachment sizes for Entourage for Mac varies based on the version that you are using. Please follow the correct procedure for the version that you are using. You have to make these changes on all Exchange 2007 client access role servers that Entourage for Mac client connects to.

Exchange 2007 and Exchange Server 2010: Microsoft Entourage 2008 for Mac, Web Services Edition, Microsoft Outlook 2011 for Mac

1. 1.This version of Entourage for Mac uses the Microsoft Exchange Server 2007 Web services provider to send mail. To allow for larger attachments that you must change the MaxRequestLength in the web.config file. By default, the web.config file is located in the EWS Virtual directory Microsoft\Exchange Server\ClientAccess\exchweb\EWS will have the following entry, by default, the max request size is approximately 13MB

   <system.web> 
   
   <httpRuntime maxRequestLength="13280" /> 
   
   .... 
   
   </system.web> 
   

2. Change the item <httpRuntime maxRequestLength="13280" /> to <httpRuntime maxRequestLength="X" /> where X is the desired value in KBs. for example, X will be approximately 50000 (50MB).

Exchange Server 2003 and Exchange Server 2007: Microsoft Entourage 2004 or Microsoft Entourage 2008, for Mac

This version of Entourage for Mac used WebDav to connect to Microsoft Exchange Server 2007. To allow larger attachment sizes you must change the MaxRequestEntityAllowed property in the IIS Metabase.xml file. To do this, follow these steps:

1. Save a backup file of the Metabase.xml file in the following directory:
   %windir%\system32\inetsrv
   
2. In Service Control Manager, stop the IIS Admin Service service.
3. Open the Metabase.xml file in the
   %windir%\system32\inetsrv folder in Notepad.
4. Locate the Exchange Virtual directory section.
5. Add the MaxRequestEntityAllowed property that contains the largest file size upload that you want to allow. Add this property under the LogonMethod property, and then save the file.
   
   The following is the MaxRequestEntityAllowed property syntax:

   MaxRequestEntityAllowed=”Size in bytes”

   Note Size in bytes is the largest file size upload that you want to allow. The following is an example of the size:

   MaxRequestEntityAllowed="31457280"

   In the following example the maximum file size upload is set to 30 MB:

   <IIsWebVirtualDir    Location ="/LM/W3SVC/1/ROOT/Exchange"
                     AccessFlags="AccessSource | AccessRead | AccessWrite"
                     AppFriendlyName="Exchange"
                     AppIsolated="2"
                     AppPoolId="MSExchangeOWAAppPool"
                     AppRoot="/LM/W3SVC/1/ROOT/Exchange"
                     AuthFlags="AuthBasic"
                     DirBrowseFlags="EnableDirBrowsing | DirBrowseShowDate | DirBrowseShowTime | DirBrowseShowSize | 
   DirBrowseShowExtension | DirBrowseShowLongDate | EnableDefaultDoc"
                     DoDynamicCompression="FALSE"
                     DoStaticCompression="TRUE"
                     LogonMethod="3"
                     MaxRequestEntityAllowed="31457280"
                     Path="\\.\BackOfficeStorage\tx1b46bdomain.com\MBX"
                     ScriptMaps="*,C:\Program Files\Microsoft\Exchange Server\Bin\exprox.dll,1"
   > 
   

6. Start the IIS Admin Service service in Service Control Manager.

Note Do not set the MaxRequestEntityAllowed property in any virtual directory other than the Exchange Server virtual directory. For example, if you set this property in the virtual root directory to a file size that is less than 1 GB, RPC over HTTP logon issues occur.

Be aware that if you set the MaxRequestEntityAllowed property on the CAS server, the CAS server returns an error message that states that the request to send a large e-mail message failed. This behavior is expected.