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Brad's TechTips - Exchange Server & Outlook

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Exchange Server 2007/2010 and Entourage: Modify the attachment size limit that affects Entourage users
Entourage users connected to Exchange Server 2007 or 2010 may not be able to send large file attachments.  Here are some steps to correct that problem:
  • Set the sending size limits wherever possible in Exchange System Manager.
  • Use Notepad or other text editor to open the web.config file found in the following directory:
       For Exchange Server 2007:
         c:\Program Files\Microsoft\Exchange Server\ClientAccess\exchweb\ews.
       For Exchange Server 2010:
         c:\Program Files\Microsoft\Exchange Server\v14\ClientAccess\exchweb\ews.
  • Search for the string "maxrequestlength" in the web.config file.
  • Modify the value to reflect the desired attachment size limit in Kilobytes. Example: 35000 indicates 35,000 KB or 35 MB.
  • Save the file.
  • Repeat the above steps for the web.config file under \ClientAccess\owa.
  • If running Windows Server 2003, then run iisreset from a command prompt.
  • If running Windows Server 2008, then run the following lines from a command prompt, replacing the number at the end of the appcmd lines with your desired attachment size. In the examples below, we use 35 MB as the desired size.  The appcmd lines are broken into two lines for readability on this page, but should be entered as a single line on your system.
         cd \Windows\System32\inetsrv
         appcmd set config "Default Web Site/ews" -section:requestFiltering
         appcmd set config "Default Web Site/owa" -section:requestFiltering
Note: Reports indicate that you should double the numbers of the limit that you actually want to set. For example, if you want to permit 35 MB attachments, then set the numbers for 70 MB.

Note for Small Business Server (SBS) 2008 users:
Run the appcmd lines, but modified as follows:
appcmd set config "SBS Web Applications/ews" -section:requestFiltering
appcmd set config "SBS Web Applications/owa" -section:requestFiltering

CREDIT: This information was compiled from a blog posting and user feedback at http://ministry-it.blogspot.com/2009/08/entourage-ews-attachment-limits.html.