So I thought that I’d install Office 2013 on a production machine in side by side mode. It WAS my understanding that you could install Office 2013 on a machine with Office 2010 and not replace ANY of the existing programs.
I completed the installed and did the following checks:
Two versions of Excel ? Check.
Two versions of Word ? Check.
Two versions of OneNote ? Check.
Two versions of Outlook ? FAIL.
That is disappointing as Outlook 2010 is REALLY one of the things that I wanted to retain. Now it is gone and I honestly can’t remember seeing a message or a warning informing me that it would be replaced. If I had seen a message I probably wouldn’t have continued with the installation.
Not a huge problem BUT still there is the lesson from today. Not replace actually means not replace everything EXCEPT Outlook in Office 2013.
You have been warned.
CIAOPS 
Feedback on issue:Outlook has always been the problem child of the MS Office suite with MAPI. You can run Outlook 2013 with other versions of Outlook but there are plenty of gotchas. The only way it gets away with this is by using App-V virtualisation. http://technet.microsoft.com/en-us/library/cc179110.aspx ” You can install a Click-to-Run version of Outlook 2013 to run side-by-side with Outlook 2007 or Outlook 2010, but it is unsupported with earlier versions of Outlook such as Outlook 2003. Also, if you install a Click-to-Run version of Outlook 2013 side-by-side with Outlook 2007 or Outlook 2010, you cannot run them at the same time. If you must install an older version of Office after you have installed the Click-to-Run version of Office 2013, you must uninstall Office 2013 first. Side-by-side Office versions are only supported when they are installed in ascending version order. Microsoft does not support installation of the MSI version of Outlook 2013 side-by-side with an earlier version of Outlook.” http://technet.microsoft.com/en-us/library/jj219427.aspx
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