I have an established blog for over a year now that I want to convert to MU. I've searched the site and have only found the following info in another post:
Backup your files and database in case you change mind.
1. at your WordPress blog, do Tools->Export.
2. install MU. You need to answer the question about the uninstall of WordPress--depends on where WordPress is now installed--depends on where you will install MU. Assume for now you need to remove the current WordPress files (you did back them up).
3. in an MU blog, do Tools->Import->WordPress.
~Can I do this so the new MU install is in the same ROOT directory as the current install?
~Will this affect any css or header image changes I made to the current install? I'm using the default theme by the way with just a few color, text and header changes.
Basically I was hoping to find a more detailed description of the process.
Thanks