Collaborate for free with online versions of Microsoft Word, PowerPoint, Excel, and OneNote. Save documents, spreadsheets, and presentations online, in OneDrive.

Securely sign in to access your Microsoft account and manage emails, calendars, and other services efficiently.

Sign in with your Microsoft account and enter your product key to get started. For help, go to office.com/support

Access and manage your Office 365 account, users, and settings from the admin portal.

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Sign in to access your Outlook account and manage emails, calendars, and tasks seamlessly.

Nov 12, 2025 · api.addins.store.office.com

Use your NIU email address and password to login. (See examples below) Students: [email protected] Faculty/Staff: [email protected] Get help

Diagnostic support and troubleshooting for Microsoft Office users.