STOP New Outlook "Look" update.

i was in outlook and got a popup asking if I wanted to see the new outlook look.

stupidly i clicked the button now I have to dig up a dozen imap passwords and re-enter them.

i just wanted to have a look not go through a epic palaver.

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how do i stop this dead in it's tracks and immediately and go back to my outlook?

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fyi this is why people hate new software and updates. it said "have a look" at the new outlook which sounds like a reskin. not a rebuild of existing files.