Do Son 
The January update recently promulgated by Microsoft has been found to severely impair the Outlook Classic desktop client. Users who have configured POP3 accounts or those attempting to manage PST data files may encounter persistent latency or total application freezing, profoundly obstructing operational productivity.
In certain instances, similar manifestations of unresponsiveness occur when tertiary applications attempt to archive files to cloud repositories, such as Microsoft OneDrive, suggesting a potential systemic commonality behind these malfunctions. At this juncture, Microsoft remains unable to provide a definitive remediation for the Classic iteration. In its official technical documentation, the corporation characterizes existing workarounds as exceedingly labyrinthine; consequently, it exhorts users to migrate temporarily to the web-based interface or the nascent WebView 2-based Outlook client.
For users disinclined to adopt the web or modernized versions, the sole remaining recourse is the excision of the offending update. One may navigate to the update history within the system settings to uninstall update KB5074109. Following a system reboot, the functional integrity of Outlook Classic should be restored.
Furthermore, Microsoft has corroborated that this particular update adversely impacts the “Sent Items” directory. Even upon the successful transmission of correspondence, the messages fail to manifest within the folder; the application remains incapable of retrieving them and frequently succumbs to a “Not Responding” state.
Therefore, for those whose professional workflows rely heavily on the Outlook Classic architecture, an immediate rollback of the update is highly recommended. Conversely, for users with more moderate requirements, the web-based alternative serves as a viable provisional measure while awaiting Microsoft’s anticipated corrective patch next month.
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