I didn't see this exact example, so sorry if this is same as another.
I want to create a mu site on it's own domain - say: MYMU.com
then I want to allow users to create there own blogs/websites as:
company1.com/blog (post)
company1.com/home
company1.com/contactus
company 2 should be able to do the same thing
company2.com/blog
company2.com/home
compnay2.com/contactus and so on.
I want the companies to look like individual sites using there own domains, but post will show up on the main mu site mymu.com
It appears to me that the software works this way as long as you don't want to have separate domains names.