Sign into Office 365 for Business to access your email, calendar, Team site, OneDrive for Business, and much more. If you have difficulties signing in this way or you would like to access Office 365 services directly, use the following URLs and troubleshooting information.
Use these URLs to sign into Office 365 for Business. If you have difficulties signing in using the main Office 365 sign-in URL, try the other URLs provided. Bookmark any of these URLs in your web browser for quick access to the services you use most frequently.
You can also use a custom domain, like http://www.contoso.com