Earlier quoted context omitted.
It made Microsoft sweat pretty good in the late-90s. They had to behave a little better, but not doing anything too anti-competitive, during a critical juncture of the internet's growth and adoption, while the anti-trust proceedings dragged on. Just because there was no AT&T style divestiture at the end, doesn't mean there were no positive externalities.
I think the biggest thing that came out of that anti-trust case is the publishing of specs for various file formats and protocols used by Microsoft software.
The actual rendering engine was left to Windows (and to anyone who was using it, like AOL), the shell was left to IE to continue wrapping around it, and a few more things.