Transferring contacts from iPhone 4 to Nokia Lumia 710?

My mom just bought a Nokia Lumia 710, and she asked me to transfer her contacts from her iPhone 4 to her new phone. I saw this video on YouTube about the "contact transfer" option in the Lumia 710, but it doesn't work. I tried it, they paired but when it says "transferring" or something like that on the lumia, it stops and doesn't work anymore. They have the same pin and *** but still doesn't work. My mom's paying me 1 per contact and she has 438 contacts. Lmao.

First of all i need half of the profits that you will make.lmao jk (unless you are willing… )lol
Sync the contacts to a google account then on the windows phone sign in to google and your contacts will be there.

Here are the websites i found useful.
http://forums.wpcentral.com/lumia-900/189343.htm
http://blogs.technet.com/b/jribeiro/archive/2010/11/23/moving-contacts-from-iphone-4-to-windows-phone-7.aspx