All phone users are always concerned about backup of their Address book. It is not only useful for transfer of contact to another phone. But also it can be used to restore phone contacts in case your mobile is stolen.
Back Up address book Windows phone
At time of initial setup of your windows phone, your mobile will ask for details of your outlook.com, live.com or hotmail account. If you don’t have any of these account, your mobile can create one for you or you can visit live.com and create new account. Provide your Username and Password on your Windows Mobile.
Once your mobile has been setup backup of contacts will be automatically created on your live.com account.
You can view your contacts by visiting live.com. After login to your account, go to people and you can see list of your phone book contacts.
Windows phone has kept it simple as does all activities in back ground. But remember you need to have internet connectivity on your phone in order to create backup.