Microsoft announced in January that they were ending support for IE9 and IE10. (See Microsoft's web page on support for older version of IE for more details). one45 will follow Microsoft’s lead and discontinue their support for these browsers as of May 1, 2017.
Beginning with any releases in May 2017, one45 will no longer be testing their tools on IE9 and IE10, and will not be addressing any bugs or performance issues that may occur when using those browsers. You may find that over time some features or functionality no longer work in IE9 or IE10. This will be a gradual change over time, as one45 makes updates in one45 that may be incompatible with these browsers.
99% of one45’s users will be unaffected by this change. Their system supports many other, free browsers that you may wish to consider if you can’t fully migrate away from IE9 or IE10. As of May 2017, one45 will officially support the following browsers: