HEY! Quickbooks 2004 worked!

This is an odd question. A few years ago, one of my clients upgraded to a Windows 7 64-bit Professional PC. She still uses QBW2004, so we installed
it on her new machine and got an error message. QBW2004 wouldn't even open. (don't remember the error message unfortunately) After fooling around with it, the IT guy was able to make QBW2004 work somehow (XP mode perhaps?).
Anyway, i just got a Windows 7 64-bit Home Premium PC and figured i would have the same problem but i decided to try to install QBW2004 on the new PC anyway. IT WORKED BEAUTIFULLY. No errors, no problems. Yet, when i search the net, it tells me that QBW2004 is not compabible with Windows 7. So, here's my odd question. Why DON'T i have a problem? Seems silly to ask why something isn't broken but things have to make sense for me. Any ideas?
BTW, before i get any complaints about using the old version, i have used every version of QBW from 5.0 to 2011. I have clients that use different versions and, in my experience, 2004 is VASTLY superior to the newer versions. (this is assuming you're not trying to use the QBW payroll system which forces you to upgrade). 2004 is more stable, more reliable and much faster than the newer versions. Also, i don't know anyone who uses all the bells and whistles that Intuit has decided to put on the new versions which slow it down. 2004 doesn't look as pretty but as far as getting work done quickly and efficiently, it is definitely the superior version IMHO.
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