Contents: – Invite External Users – SharePoint Online – Associate External Email Address with Windows Live ID – Login to SharePoint Online with a Windows Live ID Account With SharePoint Online, site administrators have the ability to share their site with internal users, users who are within the same company and have an Office 365 account, as well as up to unlimited external users per Office 365 tenant. External users are defined as partners who are not a member of your company or your company's affiliates. External users can use their existing Microsoft Online Services ID, if they themselves have an Office 365 subscription, or a Windows Live ID, which…