Microsoft says button to restore classic Outlook is broken

Microsoft is investigating a crash in the new Outlook for Windows triggered by the “Go to classic Outlook” button, which closes the app without installing the classic client. The company provides workaround methods to install classic Outlook via support links or the Microsoft Store and advises contacting IT admins for managed environments. The report also notes Microsoft’s broader rollout of the new Outlook client and references several recent non-security Outlook stability fixes.