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Outlook Classic

Microsoft is killing New Outlook's notification spam, but Classic still loads emails faster on Windows
Winsage
June 27, 2026

Microsoft is killing New Outlook’s notification spam, but Classic still loads emails faster on Windows

Microsoft is introducing a feature in New Outlook that groups email notifications to reduce interruptions and notification fatigue. Users have reported that New Outlook is slower than Outlook Classic, with email opening times taking up to 30 seconds compared to just a few seconds in the Classic version. There are also reliability issues with notifications in New Outlook, which can be inconsistent or absent for connected accounts on Windows 10 and 11. Despite the planned improvements, Outlook Classic remains more efficient for managing notifications and opening emails quickly.
Users are complaining that the new Windows version of Outlook is running slowly.
Winsage
June 20, 2026

Users are complaining that the new Windows version of Outlook is running slowly.

Microsoft has introduced two versions of Outlook in Windows 11: Outlook Classic (a Win32 desktop application) and the New Outlook. Users have reported significant performance issues with the New Outlook, noting a lag of approximately 10 seconds for tasks that Outlook Classic performs instantly. The New Outlook operates on WebView2, which involves multiple processes and higher memory consumption, while Outlook Classic runs as a single process. Microsoft is aware of these performance challenges and is testing a new API called 'Delayed Message Timing' to address them. Users find Outlook Classic to be more reliable and faster, particularly for businesses that need efficient notification processing.
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