Not on the same machine JBinarao?
Good question; and well, no; the varying versions of MS Office Suites I use are not all on the same machine. I have 6 physical machines, and around 3-dozen virtual machines. Some type of Office application is installed on about 95% of them, but they are different versions for the most part.
The machine that I use the most has Office 2007 and OpenOffice installed. I switch back and forth between the two office suites when I need to do something and (1) I want to see if a particular routine is available or (2) how simple it is.