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#11
I finally got rid of my WinXP machine [kept parts that could be reused] but am retaining the Win7 Desktop. Just for reminiscing I've kept an old white Toshiba Satellite with MS-DOS 6 and Win3.1 that works good but the battery is dead and the side-mounted trackball fell apart.
As for why to keep the old ones and as mentioned, it's mostly in business in having machines that are not easily replaced like an X-Ray machine for our local veterinary clinic and programs that have no replacement available.