Importing Contacts from Hotmail, Gmail, Yahoo using C#

Many of the social bookmark services offer a means to import/invite people from your online email accounts... This is a great feature.... Honestly, I was a bit afraid of it at first. However, I do see the usefulness of it.

I have found some help (C#) to do this... I do have some websites that this would help with... particularly those with marketing, contact lists, and newsletter features. It can be rather useful..

http://forums.asp.net/p/1083530/2279066.aspx#2279066
http://forums.asp.net/p/1083530/1982614.aspx

Yahoo class:
http://gnillydev.blogspot.com/2007/10/yahoo-contact-import-class-in-c.html

Google documentation:
http://code.google.com/apis/contacts/
http://code.google.com/apis/contacts/docs/2.0/developers_guide_protocol.html

Live/Hotmail documentation:
http://gnillydev.blogspot.com/2007/10/live-msn-hotmail-contacts-importing-in.html

I will update this with any insights as I find it... and try it out.

Where to use it:

Lets say you have a "newsletter" or "prospect management" or "social" web-software. You can use such tools to import new contacts or friends and jump-start your system with your current business/family contacts.