Can I uninstall old program versions after updating to a new version?

Jeff Card February 8, 2010
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Whenever I install a newer version of software I often see that the old version is still on the hard drive. For example the old versions of Windows programs or on a Mac, the old versions of Numbers or other such programs.
Should you just uninstall all old programs or are there some things in the old programs that are needed by the new program? It seems a waste of space to have so many old versions of different programs.

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