
Fix Outlook Not Opening After a Recent Update
After a Windows or Microsoft 365 update, Outlook may fail to open—no window appears, or it crashe...

After a Windows or Microsoft 365 update, Outlook may fail to open—no window appears, or it crashe...

Windows Defender error 0x80070422 usually appears when you try to open Windows Security or run a ...

After a Windows Update, you might see a yellow warning in Windows Security saying "Threat service...

If you see an SSL certificate error when using Windows Search (e.g., searching in Outlook or File...

You open Outlook and get an error: 0x80040154 — "Class not registered" or "module no...

If you see a DNS error in Windows Security (like "DNS server not responding" or "DNS resolution f...