Keisuke Kameyama
Director of Academic computing & communications center

Yutaka Tagawa
Leader of Information Security Incident Response Team & Information security risk manager

Support for Internet Explorer 11 (“IE 11”) for Windows 10 (excluding Windows 10 LTSC and Windows Server) will be end on June 15, 2022. In addition, support for IE 11 for Microsoft 365 apps will end on August 17, 2021.

If you are using the above web browser, please use the new Microsoft Edge as there will be security issues after the end of support.
https://blogs.windows.com/windowsexperience/2021/05/19/the-future-of-internet-explorer-on-windows-10-is-in-microsoft-edge/
https://techcommunity.microsoft.com/t5/microsoft-365-blog/microsoft-365-apps-say-farewell-to-internet-explorer-11-and/ba-p/1591666

If you are using an Internet Explorer-based website or legacy app on an existing system, etc.
Please use Internet Explorer mode of Microsoft Edge.
https://support.microsoft.com/en-us/office/internet-explorer-mode-in-microsoft-edge-6604162f-e38a-48b2-acd2-682dbac6f0de