Microsoft Confirms Windows 11 Security Update KB5074109 Causes Outlook Freezes for POP Email Users

Microsoft has confirmed that the January-released security update KB5074109 for Windows 11 is causing crashes and freezes in the Outlook Desktop client for users with POP email accounts. The issue specifically affects classic versions of Outlook, with no reported impact on IMAP or Exchange accounts. No fix has been announced to date. The update in question targets security vulnerabilities but its deployment results in malfunctions for POP users.