Comment by greatquux

"Classic" was never very stable to begin with, and seems to be getting less stable every monthly patch cycle. Decades-old problems remain unfixed, and "new" Outlook still doesn't have all the features of the old one (or compatibility with in-house programs that use MAPI integration, or COM add-ins). "Classic" must have been such a spaghetti-fied mess that they thought they couldn't actually fix it at all and needed to replace it. But I'm not sure that's really the solution... is it ever?