Sign in with the account you use for SkyDrive, Xbox LIVE, Outlook.com, or other Microsoft services.
Sign in with the account provided by your work or school to use with Office 365 or other Microsoft services.
Learn More
In Office 2007 or Office 2010 you can place your favorite commands in the aptly named Quick Access Toolbar (QAT) to always have them at the ready regardless what tab or Ribbon you are working in. Doug Thomas shows you the how in this short video.