I have no experience with Office 2013, but all previous versions allow side-by-side installation, provided you install from earliest to latest. The only Office app you've been restricted to one of is Outlook.
Of course, if you're installing 64-bit Office 2013, that may have issues co-existing with a 32-bit installation of an earlier version. I have no experience with this either, however, as I only run Office 2010 in 32-bit mode.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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