I'm doing some work for a company (remotely).
I installed Microsoft Web Installer - PHP, which stopped the SBS 2011 server from getting passed the applying computer settings.
I had to pull the power several times to access safemode and uninstall the software. This is now resolved. However users ar complaining they still arent getting emails.
I cant see anything wrong on the server, and an MXLOOKUP on the domain using mxtoolbox.com shows SMTP is working ok.