I'm caching viewlets per every user on my website. The first session
created on internet explorer is the cache that displays for every user
User A logs in, and sees their cached data A, user A logs out.
Then user B logs in, and sees cached data A, user B logs out.
Then user C logs in, and sees cached data A, user C logs out. And so
On firefox and chrome, users see their correct data.
In order for IE to display the correct data, i can delete temporary
internet files, refresh the page and correct data is displayed.