By Sergiu Gatlan
Publication Date: 2026-01-21 15:12:00
Microsoft shared a temporary workaround for customers experiencing Outlook freezes after installing this month’s Windows security updates.
As explained one week ago, when Microsoft acknowledged the issue, the bug causes the classic Outlook desktop client to hang for users with POP email accounts who have deployed the KB5074109 security update on Windows 11 25H2 and 24H2 systems.
Other symptoms include the inability to reopen Outlook without ending the process via Task Manager or restarting the device, Outlook redownloading emails, and emails not appearing in the Sent Items folder even though they were sent.
In a Tuesday update, it added on the Windows health dashboard that any app may “become unresponsive or experience unexpected errors when opening files from or saving files to cloud-backed storage, such as OneDrive or Dropbox.”
“For example, in some configurations of Outlook that store PST files on OneDrive, Outlook might become unresponsive and fail to…
