Sign out of Office - support.microsoft.com
support.microsoft.com › en-us › officeIn any Office app, go to File > Account (or Office Account in Outlook) > Sign out. Close all Office apps. From Office for Mac In any Office app, select the name of the Office app in the top menu. Select Sign Out. Quit out of all Office apps. On Office Online In the upper-right-hand corner of your web browser, select your picture or initials.
Office 365 login
https://www.office.comCollaborate for free with online versions of Microsoft Word, PowerPoint, Excel, and OneNote. Save documents, spreadsheets, and presentations online, in OneDrive.