I switched exchange hosts for my email (outlook 2007) and I have removed the old profile in outlook. I'm still getting the pop up to login to the old exchange host. I've called both hosting companies multiple times and they've each said this is a msoft issue in outlook and I need to check with Msoft support to have them help you remove this old cached info that is making this prompt keep coming up evertime I'm in outlook. Important note- I backed up all my pst files and transferred them to the new host and outlook so this may be causing issues (I don't know) but I really need to keep all the old calendar and mail data that I transferred over. Please help me get rid of thes annoying pop ups!