Miscellaneous topics that do not fit into specific categories.
I'm on those builds too, though not using IMAP. Perhaps something to do with Outlook was damaged in the upgrade.
What happens when you run: outlook /safe
That starts it without several things, like the reading pane, toolbar customizations, and add-ins. If that works, you can work backwards to see specifically which is the problem.
You can also try to narrow it down by disabling the accounts and seeing if it starts normally. If so, add them back one at a time.
Sometimes other switches can mysteriously fix things like this, such as /cleanreminders.
Thanks for the suggestions, but for some unknown reason, it's now back to 5 seconds to start up!!!
Who knows what was going on under the bonnet!