I've been working for about a week on a WordPress Multisite hosted under the Rackspace Cloud Sites infrastructure. Initially, I was told repeatedly by Rackspace Customer Support that WordPress Multisite is supported, but they don't support Wildcard subdomains, so it seemed possible albeit difficult.
I've now received word from a higher level technician that Rackspace does "not support the coding or configuration of WordPress MU itself."
It would seem that Rackspace is the best possible solution for a medium sized network of blogs, the scalability primarily. I was set on Rackspace. Still am.
Does anyone have a functioning Multisite network on any Rackspace infrastructure? If so, do you have domain mapping functioning as well?