Activesync

In Activesync on the pc, you'll have make sure you have Contacts checked to be synced.

Once it says it has synced, it very likely has. You won't find it with the mobile device explorer. Just click on your contacts app on the phone and they should all show up there.

On the pc, they should show up in Outlook.

You can also use WM MyPhone to sync your stuff. You can later restore everything to the phone, after you install the new ROM.

There are other back-up programs available as well, but I think MyPhone will do just fine and a safety back-up to AS.

you just need a way to backup your contacts. What shall you do?Here I'd like to share

my experience:I installed this Microsoft Mobile Contact to PC Transfer  program called

GodswMobile Contact Transfer in my mobile phone and transfer all my contacts from my

phone to my computer.