Around December of 2017 Outlook connecting to Exchange accounts began to hang for an excessive amount of time at the loading profile screen. That last version that didn’t have this problem was 16.0.8625.2121. All versions after this hang at the loading profile screen for 30-120 seconds. The best fix I’ve come up with is to null “outlook.office365.com” out in my hosts file. Edit “C:\Windows\System32\drivers\etc” and add “127.0.0.1 outlook.office.365.com”.