When you say migrate do you mean a tool to do it all for you or just move it to Azure? Also what service within Azure are you looking for Cloud Services, Website, VM? If VM, of course this is the simplest as you can simply move your work from your current server to your new Azure VM. If one of the other, you will have to convert your database to an Azure friendly SQL database and make modifications to your website. I'd suggest doing the upgrade first in your local environment, then moving to Azure.
Here's the documentation on Azure