How to Fix Outlook 'Connection Refused' Error from Antivirus Blocking
If you see a 'Connection refused' error in Outlook, especially when sending or receiving email, y...
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Browse labFix Windows Defender Error 0x80070643 on macOS
If you see error 0x80070643 when installing or updating Windows Defender on a Mac (via Parallels,...
Fix Windows Search Authentication Failed in Outlook Sync
When Outlook syncs, it uses Windows Search to index emails. If Windows Search authentication fail...
How to Enable Windows Defender Service Manually
If Windows Defender won't start or you see warnings that it's turned off, the underlying service ...
Fix Windows Activation Port Blocked by Another Application
When you see an error like "Windows activation port already blocked by another application," it u...
Windows Defender Not Working After Update: Checklist
After a Windows Update, Windows Defender (now called Microsoft Defender Antivirus) may stop worki...