SCCM 2012 SP1 installation reboot behaviour on 3010 return code

Recently, we had a situation where we deployed a small client via SCCM 2012 SP1.

All tested fine and the pilot group appeared fine - but upon deploying the client widely, the customers helpdesk started getting calls about a reboot message popping up.

Sure enough, the msi has a /noreboot switch and wasn't causing a reboot on test machines where the command was run outside of configmgr.... so what was happening?

Well - as detailed here - http://www.1e.com/blogs/2013/05/07/sccm-2012-agent-reboots-when-msiexec-uses-reallysuppress-switch/

a setting - which i think it is fair to say, a setting which isnt very clear, will cause the CM agent to initiate a reboot, even if the install command line supresses the reboot, but the return code is 3010 (soft reboot).

A little disappointing - this is the type of thing that really should be very clear in the interface.... but once finding out, its unlikely we (or you) will make the same mistake again!