Confirm that your Microsoft Outlook client is up to date Office Account > Update Options > Update Now
Consider disabling “Show Apps in Outlook” in Outlook Options > Advanced
Consider disabling Message arrival notifications, these include “Play a sound”, “Briefly change the mouse pointer”, “Show and envelope icon in the taskbar”, and “Display a Desktop Alert” in Outlook Options > Mail
Consider disabling “Use animations when expanding conversations and groups” in Outlook Options >Advanced
Consider disabling “Show Weather on the calendar” in Outlook Options > Calendar