Signing in to portal.office.com for the first time is simple. Start by opening your browser and navigating to the site. Enter the email address provided by your organization or Microsoft. Click Next and type your temporary password, which your admin should have shared with you. After signing in, you'll be prompted to change your password—ensure it’s secure and memorable. If required, set up multi-factor authentication for added security. Once complete, you’ll have access to the Office 365 portal, including apps like Outlook, Word, and Teams. Bookmark the site for quick access in the future.