Peter Perry reports….
“I installed the new rollup update for BPA on all my SBS2011 boxes. All the new recommendations are fine except the below. If I change the web.config file to match the transport setting as suggested (even ones still at the out-of-the-box 10MB default), users complain they can’t delete email from OWA and they receive an error. Even worse, it completely breaks email flow on Blackberry devices with BES installed. I confirmed this issue and restored the setting back to 2097151. Something is amiss with Microsoft’s instructions.”
When working with SBS2008, the correct command to set the limit would be:
appcmd set config “SBS Web Applications/ews” -section:requestFiltering -requestLimits.maxAllowedContentLength:[size in bytes]
ie. not the Default Web Site
Here is a good explanation about the impact of the different values and how to correctly set them in E2007 and E2010 respectively:
Obviously BPA seems to give wrong advice.
So for now… ignore that BPA item. Bug filed.