I have my application built upon latest Bootstrap Version 3.0.3. Everything was running fine on Chrome and Mozilla. Now suddenly, people want it to support IE7 and IE8. I have tried implementing Bootstrap 3 for IE7 , but it didn't help. Everything still stays dis-aligned.
Things are still messed up in IE 7 and IE8.
Do I need to manually override the Bootstrap Styles? I doubt, bootstrap being so extensible and popular, must have done something to support IE7.
Don't use Twitter's Bootstrap 3 if you will have to support IE7. Twitter's Bootstrap 3 has many changes (Updating Bootstrap to version 3 - what do I have to do?, http://bassjobsen.weblogs.fm/its-a-shame-the-newest-version-of-githubs-most-popular-projects-is-not-backward-compatible/) don't try to fix them for IE7. Consider to use the latest 2.3.2 version, nothing wrong with it. You simple can't have both; support for older browsers and the newest HTML / CSS support.
来源：https://stackoverflow.com/questions/20615535/twitter-bootstrap-support-for-ie7