In an effort to start testing site in IE8 while maintaining the ability to test in IE7, I tried Tredosoft's Standalone Internet Explorer 7 and Multiple IE along with an upgrade to IE 8 Beta. Browsing is possible in IE6, IE7, and IE8, but IE7 and 8 share two problems.

1. Once IE7 and IE8 are both installed, their pop-up blockers refuse to turn off.
2. The pop-up blockers start triggering on things like form select menus.

Ever tried to test a form when you can't see the select menus? Useless. Every time you open a select box, the pop-up blocker stops it. Thought your pop-up blocker was turned off? It might be, but it makes no difference. Add the site your testing to your trusted domains? Makes not difference. I also tried Internet Explorer Collections to install Internet Explorers 6, 7, and 8. Identical problems. They do install, and you can test page layout, but testing anything that might induce a pop-up like effect, including form select is not going to happen. Uninstalling either package will not fix the problem. My solution with Tredosoft was to uninstall their products, then IE8, then install IE8 again. Just reverting back to IE7 itself didn't fix the problem, it required the re-installation of IE8. My solution with the Internet Explorer Collection test was also to install IE8, but in this case IE8 was part of the collection itself, so once I uninstalled their product, I was already at the IE7 stage. To get full IE7 functionality back, you might be able to uninstall IE7, then reinstall, but I haven't tried that. For the moment I'm satisfied to test IE6 (Multiple IE) and IE8 beta2. They don't seem to conflict at all. If you've found a way to install IE6, IE7, and IE8 with moderately complete functionality, please let me know.