I looked at a few other questions similar to mine but they all talk about web/email/database on the same server. My question is a bit different. My business uses SQL Server 2008 as its backbone and .Net for the front end. We are outsourcing a redesign to our web site and the outsourcing people want to build this using WordPress. Which the people building this don't know how to connect it to SQL Server 20XX (even though I have seen articles that say it can, but I don't know how to do it either so I can't throw stones at it.) and will need to install MySQL.
So my question is, is it ok to have both SQL Server 20XX and MySQL running on the same server or does this break the one function one server rule?