Ok, so I am finally going to update my T-Mobile Phone after so long, but am worried about the contacts on my phone. Do all the contacts get deleted? I've read through the 3 pages, but didn't see it answered. Can someone who has done the update let me know?

I moved all my files off, but don't know about the contacts. It's saved in my outlook, but I don't want to manual input them back on (over 400 #'s).
Thanks in advance for any help or response.