Antivirus scanning exclusions for Lync Server 2013
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Assessing Microsoft 365 network connectivity
Open PowerShell and run it as Administrator. Execute the command Install-Module -Name NetworkTestingCompanion -Force. Create shortcuts on your desktop and in the Start menu with Invoke-ToolCreateShortcuts. Start the UI with Invoke-NetworkTestingClient.
Lync.se - Network Testing Companion
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Get-Exchange2019AVExclusions.ps1
https://crt.sh/ This site shows you every SSL cert that was registered for any domain.