BuddyPress.org

Glad you got it working. It’s possible to change, but not easy. Of course, ensuring you’ve backed up EVERYTHING:

In the Admin, go to the Site Admin -> Blogs page. For each blog, click the edit link. You’ll then want to update the fields to be consistent with the *new* location you want each blog (i.e. check Domain, Path, Siteurl, Home, Fileupload Url).

Then, there’s one line in the wordpress config file that tells WPMU to use subdomains instead of subdirectories. Change:

define('VHOST', 'yes');

to:

define('VHOST', 'no');