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.
SkyDrive Pro lets you sync your SkyDrive library or other SharePoint libraries on team sites to your computer. You can then work with files in these libraries directly in Windows Explorer. You can access these files even when you’re offline. Updates to files sync with SharePoint whenever you’re online.