I'm really sorry if someone have already discussed that problem before.
Unfortunately my computer just crashed and I have lost all my data. I still have my contacts on my iphone and I was wondering whether it is possible to transfer all my contacts from my iphone back to the computer... please help me.
Hope to get answers as soon as possible.

You can use outlook express to back up contacts and messages.
I have done this but it was not the easiest thing to do.
You need to go to info in your iphone settings in itunes, select where you want to back it up to in outlook or yahoo, winddows or google, then sync your phone and job done.
What's more,this article how to transfer music/songs from iPhone to PC maybe can make a effort of transfering iPhone contacts to computer.
Hope it worked for me as well.

Yes, this is not a simple process, but i know how to finish that easily. I have read an article called "How to export iPhone contacts as .CSV to computer?" , It explain clearly of how to transfer iPhone contacts to computer. Hope it can help you.