The website msportals.io is listing a nice overview of Microsofts portals. For example administrator portals:
Microsoft 365 Admin Portals
- Microsoft 365 Admin Portal https://admin.microsoft.com aka.ms Old 🔗 Alt
- Microsoft 365 Apps Admin Center https://config.office.com
- Exchange Admin Center (EAC) New https://admin.exchange.microsoft.com
- Exchange Admin Center (EAC) Old https://outlook.office365.com/ecp/
- Kaizala Management Portal https://manage.kaiza.la/
- Microsoft 365 Compliance https://compliance.microsoft.com
- Microsoft 365 network connectivity test https://connectivity.office.com
- Microsoft 365 Network Insights Preview https://portal.office.com/adminportal/home#/networkperformance
- Microsoft Call Quality Dashboard (Teams) https://cqd.teams.microsoft.com
- Microsoft Call Quality Dashboard (Lync) https://cqd.lync.com
- Microsoft Endpoint Manager Admin Console Intune https://endpoint.microsoft.com aka.ms
- Microsoft Endpoint Manager Admin Console Release Candidate https://rc-devicemanagement.portal.azure.com
- Microsoft Endpoint Manager Admin Console Old https://devicemanagement.portal.azure.com
- Microsoft Intune for Education https://intuneeducation.portal.azure.com
- Microsoft Online https://portal.microsoftonline.com/IWDefault.aspx
- Microsoft Store for Business https://businessstore.microsoft.com
- Microsoft Store for Education https://educationstore.microsoft.com
- Microsoft Stream Admin Center https://web.microsoftstream.com/admin
- Microsoft Teams Admin Center https://admin.teams.microsoft.com aka.ms
- Microsoft Teams Rooms Managed Services https://portal.rooms.microsoft.com/
- etc
Many more can be found on msportals.io.
