One of our customers called in and reported that he is experiencing problems when he tries to send an e-mail from Outlook for Mac or from our OWA page. By default Exchange sets the maximum sizes for messages like this:
OWA: 30 MB
IMAP/POP (that’s Exchange Web Services (EWS)): 13 MB
Active Sync: 10 MB
If you decide that your users should have more than the default message sizes you can change the defaults by changing the following:
1. Increase the ‘maxRequestLength’ of web.config (found in ‘ClientAccessexchwebews’ & ‘ClientAccessowa’).
2. Increase the ‘maxReceivedMessageSize’ of web.config (found in ‘ClientAccessexchwebews’).
3. Open a command prompt and type the following:
appcmd set config “Default Web Site/ews” -section:requestFiltering -requestLimits.maxAllowedContentLength: SizeInB
appcmd set config “Default Web Site/owa” -section:requestFiltering -requestLimits.maxAllowedContentLength: SizeInB
4. Do an IISRESET.
Hope that you find this helpful.