For the best security and functionality, keep your web browser up to date. All modern browsers should update automatically, but please make sure your browser has auto-updates enabled. Microsoft Edge and Internet Explorer will get their updates through Windows Update; it's important that you install those updates as they become available. For the smoothest user experience in Office 365, it is recommended to use the following web browsers: Microsoft Edge/Internet Explorer, Mozilla Firefox, Google Chrome, or Apple Safari. Microsoft's list of absolute minimum browser requirements can be found here.
To log into your Office 365 account, go to Outlook on the web.
Edge/Internet Explorer - Recommended using latest "release".
Safari - Recommended using latest release.