The question "can you run version 8 with older versions of notes?" appears with surprising regularity on the Domino 8 Forums. Today, I noticed that someone had provided a very impressive link to a web page containing a picture showing someone running ... and I quote....
"Notes R5, 6, 7 and 8 Standard running concurrently on one Windows machine, and side by side the Notes Client, Domino Designer and Administrator of each version - no image manipulation (besides scaling), no VMs, no tricks... "
It's so impressive that it deserves a referral.
Well done guys!