Exchange 2010 SP3 upgrade on SBS 2011 - Setup cannot continue with the upgrade because the 'console' (Windows SBS Console) process has open files. Close the process and restart Setup.

During an installation of  SP3 for Exchange 2010 on an SBS 2011 server, this error appeared when performing the readiness checks. Having rebooted the server and ensured that the SBS Management console was shut it seemed a little odd.

However, launch task manager I could see that the "console" process was still running even though the window had been closed.

I ended the console task and re-ran the readiness check which then passed. Problem solved.