When they realised that they wouldn't be able to marginalize the web, they licensed the Spyglass browser and bundled it as Internet Explorer. That was remarkably successful, as Windows users used that instead of bothering to install Netscape, and it wasn't long before many websites wouldn't work properly with anything but IE. However, over time Microsoft apparently put IE on a back-burner for further development as they tried to herd people back into their proprietary protocols. That left an opening for a comeback of Netscape in the form of Mozilla.