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>>And I'm strongly agreed with Thomas that any applications must be tested on the same OS as the user has, but in this case we must have a lot of the PC
>>with the different OS.
>
>It can be done on one PC using Virtual PC or VMware to test under different OSes.
Hi, Sergey!
Yes, I know that it may be done under Virtual PC, but in the some cases not only OS but PCs are quite different and nothing can't "push" the some clients to upgrade it.