Can QBP2007 and QBP2009 be installed simultaneously on the same computer? I am running XP-SP3. Can the company files interchange although this would not be the case since they are currently different companies?
Yes. Just be sure to install 2007 first and then install 2009 in a different folder.
No. The 2007 files can be upgraded to 2009, but once that is done 2007 will not be able to open them. (You can keep one company file in 2007 and another in 2009 and use each with the appropriate QB version).
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