I'm trying to convert an existing website to Multisite and I want to use subdomains.
As I try to install Multisite, I get this message: We recommend you change your siteurl to MYSITE.com before enabling the network feature. It will still be possible to visit your site using the www prefix with an address like http://www.MYSITE.com but any links will not have the www prefix.
Is it essential to do so? I searched the forum and other people had similar questions, but most of them were planning to have further installs as subdirectory and not on subdomains.