What browsers are supported for Microsoft Office 365?

Microsoft Edge

Office 365 is designed to work with the latest version of the Microsoft Edge browser. For a list of known issues connecting to the Office 365 service, using the Microsoft Edge browser, please see Microsoft's knowledge base article, Known Issues Connecting to the Office 365 service from Edge Browser.

Internet Explorer

Office 365 is designed to work with the current or immediately previous version of Internet Explorer. Microsoft recommends that you upgrade to the latest version of Internet Explorer after it is released. Office 365 might continue to work with versions of Internet Explorer other than the current and immediately previous versions for some time after the release of a new version of Internet Explorer, but Microsoft can’t provide any guarantees.

NOTE: Beginning January 12, 2016, Microsoft is implementing changes across Office 365 workloads, which will result in a significantly diminished experience for Office 365 users on Internet Explorer 8 and Internet Explorer 9. The timing of this change is in line with Internet Explorer browser support changes in Windows.

Firefox, Chrome, and Safari

Office 365 is designed to work with the current or immediately previous version of Firefox, or the latest version of Chrome or Safari. Microsoft supports only browser versions that are also supported by the browser’s manufacturer. Typically, this is only the most current version. Firefox and Chrome are both designed to stream updates your devices every six weeks. Many common problems with these browsers are resolved in the next update.

For more information, please review this Microsoft's articles:

Office 365 System Requirements