IE7 will have tabs

At last IE7 will have a tab , before it they concern about why they dont use a tab ; taken from the Microsoft Internet Explorer Weblog

Dean : "Some people have asked why we didnt put tabs in IE sooner. Initially, we had some concerns around complexity and consistency will it confuse users more than it benefits them? Is it confusing if IE has tabs, but other core parts of the Windows experience, like Windows Media Player or the shell, dont have tabs? ".

and then, taken from informationweek they (; Microsoft's Internet Explorer development team) acknowledges that it was a mistake not to build tabs into IE earlier. Opera n Firefox already do that !

However, what about the "IE7" security ?