Sign-in with your Windows Live ID
You can use the Live ID to sign-in with Hotmail, SkyDrive, Xbox, Live Games, Windows Live Mail and many other Windows Live services or software, including third-party web-services. If you are using social networking services such as Facebook, MySpace, Flickr, WordPress, YouTube, Photobucket, CNET, Dig, Last.fm, StumbleUpon and many others, you can use Windows Live ID to connect, share and start getting updates from your network. It's recommended to use different passwords of the third-party websites that you associate a Windows Live ID to prevent hackers in taking control of all your accounts, in case any of the services will become compromised.
Note that if you already have a Windows Live ID, you can create another one and then associate it to the existing Live ID or Hotmail account. This allows you to choose which Live ID to use when playing online games, using messenger service or other online Windows Live services.
If you will experience problem in using Windows Live ID, don’t worry because there are solutions to it e.g. Solution for error message, “Windows Live ID isn’t available at this time" or Error code “0x800ccc0e when using Windows Live Mail"
Windows Live ID is your key to access many services by Microsoft which contains personal information you’ve entered in your profile. You should keep the password strong and secure to prevent hackers in using your account. See the article, “Creating and Using Strong Password".