After installing the Office apps, you'll want set up Outlook to start using email, calendar, and contacts.
On the Windows Start menu, search for Outlook, and select it.
(If you're using a Mac, open Outlook from the toolbar or locate it using the Finder.)
If you've just installed Outlook, on the Welcome page, choose Next.
Choose File > Info > Add Account.
Enter your Office 365 email address and choose Connect.
Enter your password, select Remember my credentials, and choose OK.
Choose Set up Outlook Mobile on my phone, too if you want to install the Outlook Mobile app. Choose OK.
To make your new account the default Outlook account, choose File > Info > Account Settings > Account Settings, select your new account, and then choose Set as default.
On the Email tab, select your new account and choose Set as Default.
On the Data Files tab, select your new account, choose Set as Default, choose Yes when prompted, and then choose Close.