Microsoft Outlook has been criticized for performance issues, exemplified by an incident during a NASA livestream where an astronaut reported two malfunctioning Outlook applications. Additionally, a tech commentator shared a video showing Outlook taking over 15 seconds to display an email after a notification was selected, which was not linked to recent Windows updates. Outlook faces competition from alternatives like Samsung Email, Gmail, and Apple Mail, which are considered superior due to their use of native user interface frameworks. Microsoft is working on replacing web-based applications with fully native counterparts for Windows 11 to improve performance and restore user confidence.