Hi Jay and 7th;
Starting with my first windows phone, win6 phone and outlook 2003, and currently in my phone win8.1 and outlook 2010 (currently using) I have loads of extra data associated with each contact which I have collected over the years.
Not only is it possible with Outlook 2003 thru 2010 and wphones to have addresses and phone numbers in your contacts, but you can store much more.
Look under "other", and you will find birthday, significant other, etc. which is great information when working with bisnuess contacts, friends and relatives.
Apparently contacts.live is unable to mine and store that data off my phone. Just seems to have my Hotmail contacts. Whoopie considering that there is not much there.