Which versions can I get rid of (safely)?

[Len Morgan]

In my search for the "missing" documentation (which I found by the way), 
I noticed I had a folder for each version I've ever had from the 2.7 
series and up.  2.7.0-gm1, 2.7.1-gm1, ...2.8.1-gm3 etc.  Which of these 
folders can I delete without messing up my installation?  I only need to 
support 2.8.1-gm3 right now (and 2.9 betas go in the Enterprise folder 
for now).  Can I just delete the folders or do I have to do some sort of 
uninstall on each one to properly clean up?

I have always saved my stacks in other places so there's nothing I know 
of in any of the other folders that I need to keep.

Thanks!

len morgan