Fastmail ended support for Internet Explorer on March 24, 2022.
Internet Explorer is an older, less secure web browser. In 2021, Microsoft announced that they will be ending support for Internet Explorer in June 2022, after which time they will disable the IE11 desktop application through a Windows 10 cumulative monthly update and redirect users to Microsoft Edge. Based on this, we made the decision to end support for Internet Explorer on a similar timeline.
What to do now
The easiest option that we can suggest is switching to Microsoft Edge, as this is likely already installed on your computer.
If you are interested in trying a different browser, a full list of browsers that we support can be found here.