In microsoft.public.money, MikeV06 wrote:

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It is possible to have more than one year installed at a time, Yes.
Only one can be open at a time. Pay attention during install. I
don't remember Money Plus suggesting it might uninstall earlier
versions by default, but it is possible I checked to not uninstall
without making note of it. I am not sure.

They will need to work with different files, so might want to copy
your earlier file to Something08.mny and convert that file. Each
version will have its own MRU (most recently used) list to remember
which file to open.

The only caveats I can think of are the last-installed is set up
with the file associations, so if you double-click a file in
Windows Explorer, then Money Plus would try to open it. Similarly,
when you download an OFX or QIF, the last installed gets fed the
file. To feed the file to both, save the file to disk, and do
File-> Import to both. Just clicking a link sends the file to the
last-installed. You could manually adjust the associations, or
could reinstall 2004 to reset the associations. But since Money
2004 is not going to process those files after expiration anyway,
that becomes moot. If you were using Money 2006 and wanted to also
have Money Plus installed, then that would be a consideration.

Is it possible to have both Money 2004 and Money 2008 on the same machine?