Sign in to Office 365 for business on your computer or tablet by opening a web browser.
2. Type your user name and password, and then select Sign in.
TIP: The first time you sign in, you'll use the work account and temporary password that you received from your manager or support team. Your work account is typically the same email address you use to sign in for work.
3. If this is your first time signing in, you're asked to change your password. Type a new password, and then select Save.
4. To sign out of Office 365, select your name in the upper left corner and select Sign out.
TIP: After you sign in for the first time, you can go to http://portal.office.com and sign in anytime using your work account and new password. For quick access, you might want to add the sign-in page to your favorites.