Microsoft has released emergency, out-of-band updates on Saturday for Windows 10, Windows 11, and Windows Server to fix an issue that prevented Microsoft Outlook from opening when using PSTs stored in cloud storage.

There are workarounds, though.

Microsoft shares workarounds for a Windows 11 KB5074109 bug that breaks Outlook for POP email accounts and PST files.

Microsoft seems to have messed up again with its latest Windows 11 update, which borks the classic Outlook app. Earlier this month, classic Outlook struggled to open encrypted emails. Now, Neowin reports that several users are saying the latest Windows 11 update (KB5074109) has made classic Outlook completely unusable.

What is Microsoft 365 451 4.3.2 Temporary Server Error and how to fix it? Microsoft 365 faced outages affecting Outlook, Teams, Defender, and Purview. Users reported over 11,000 issues. The error indicates server-side problems.

While millions await permanent resolution from Microsoft, Stellar Repair for Outlook is helping hundreds of users remedy the situation by offering an immediate and proven solution. This powerful yet remarkably easy-to-use DIY tool quickly repairs and restores corrupted or inaccessible PST files.

Outlook may resend old emails primarily due to synchronization glitches between local devices and email servers. These issues often stem from corrupted local cache files (OST/PST) where Outlook stores email data, causing historic messages to be reprocessed ...