Would it be appropriate to ask why Ubuntu One for Windows stopped using the HOME environment variable between v2 and v3? I'm talking about software design philosophy, security considerations, why it's such a high priority to deny us flexibility in setting up our Ubuntu One sync directory the way we want, etc. Not a support question, just curious. I'm not looking for opinions or speculation, I have those already -- just the software design philosophy for that sort of decision.
I was using HOME as a way to fool Ubuntu One into using a directory on a more appropriate drive than USERPROFILE, and that's not working in v3.
I could point out that Microsoft provides a very easy way to change the location of My Documents so it is outside of the USERPROFILE, e.g. on drive D:, and when this happens Ubuntu One is unable to monitor any folders there. This means that one of the directory trees on Windows that the user is by design allowed to use is being denied by Ubuntu One, so an answer like "best practice says USERPROFILE is the best place for the user to put files" is incorrect, at least when "My Documents" is somewhere else.