Users are encountering a critical bug in the New Outlook for Windows, also reported on Outlook for Mac, concerning the Calendar view. This issue prevents modal dialogs from displaying when attempting to create, edit, or duplicate calendar events. When these actions are initiated from the Calendar view, no dialog window appears, rendering the user interface unresponsive for that specific task. Even switching to Mail view does not always resolve the problem, sometimes preventing the application from closing properly. Crucially, the same functionalities work perfectly when accessed from the Mail view. Outlook Web and Teams Calendar are unaffected, highlighting the issue’s confinement to the desktop application’s Calendar module. This significantly disrupts scheduling workflows, forcing users to manage calendars solely via viewing or by resorting to alternative applications. The problem has been observed across multiple users, Windows, and Mac, and is not tied to specific devices or accounts. Extensive troubleshooting, including app repair, resets, reinstallation, and data clearing, has not yielded a permanent solution. It is suspected to be a UI layer regression within the New Outlook’s Calendar framework, specifically affecting modal dialog rendering when triggered from the Calendar canvas. The request asks for confirmation of this known issue, workarounds, potential links to recent updates, and an estimated fix timeline. A confirmed workaround involves using the Mail view to create events or utilizing Outlook Web/Teams Calendar.