Zendesk will no longer support Internet Explorer 8, 9 or 10 from April 11th 2016
support.zendesk.com
support.zendesk.com
My impression has been that most web apps that have killed support for IE10 and below are developer-friendly tools like GitHub[1], Bitbucket[2], etc.
[1] https://help.github.com/articles/supported-browsers/ [2] https://confluence.atlassian.com/bitbucket/which-browsers-do...