Last year, Microsoft Teams stopped working on IE11, as did over 1,000 popular websites like Instagram and Twitter. While this year remaining Office 365 apps have stopped working on Internet Explorer, and next year the browser is reaching its end of service entirely.
So even if you decide to stick with the veteran browser for now you’ll have no choice but to make the switch further down the line.
There are also a number of other options to help keep you safe from this ongoing threat. The Internet Explorer zero day vulnerability can be taken advantage of using specially crafted Office documents.
So until a patch addressing the flaw is released it’s best to avoid opening Office documents from any untrusted sources.
Microsoft has said that there are a number of mitigations to this threat.