Any experience building a new site with an existing domain and email?

I have a potential customer who has an established site that he needs overhauling. I am pitching a conversion to WordPress and all the goodies that I can use from wpmudev but I am worried that I might break their existing corporate infrastructure…!

They have an Exchange service and all their email flows through Their existing website is

What is the safest way to develop a WordPress site that will ultimately be without interfering with their other applications.

Sorry if this is outside of the scope of wpmudev – any guidance as to where I can ask the right questions, or even where I can outsource the technicalities would be appreciated.

Thanks :slight_smile: