These portals are not Microsoft owned or controlled, but provide free and useful tools.
3rd Party Portals
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Microsoft Portals
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ChangeWindows
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Microsoft Token Analysis Tool
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Message Header Analyzer
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Microsoft Mac Downloads
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Microsoft 365 Licensing Diagrams
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Defender for Endpoint Blog and KQL-Tools
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Office 365 ATP Safe Links Decoder
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MSShells.net PowerShell modules for Microsoft 365 / Azure
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Tenant Availability Check
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Twitter - Microsoft 365 Status Page
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What is my Microsoft Azure and Office 365 tenant ID?