OS/2, Ecomstation & Arcaos - Microsoft Mouse for DOS & OS/2 from 1990, strangely enough there is no mention of MS Windows on the package at all. https://www.ebay.co.uk/itm/Microsoft-Mouse-PS-2 -Version-Serial-interface-included-for-DOS-OS-2-Systems ...
![Microsoft IntelliMouse 3.0 - Mouse - 2 button(s) - wired - PS/2 - white - retail : Amazon.co.uk: Computers & Accessories Microsoft IntelliMouse 3.0 - Mouse - 2 button(s) - wired - PS/2 - white - retail : Amazon.co.uk: Computers & Accessories](https://m.media-amazon.com/images/I/31F8EEZD6TL._AC_UF1000,1000_QL80_.jpg)