The following is a collection of Microsoft 365 administration URLs. Starting with person user administration and then following with server URLs.
Personal useful user links
Microsoft 365 Account
https://portal.office.com/account/
Microsoft 365 Profile (new)
https://myprofile.microsoft.com/
Security Info (new)
https://mysignins.microsoft.com/security-info
Delve (Office 365 Profile)
https://delve.office.com/
Microsoft 365 licensed software download
https://portal.office.com/account/#installs
Users AzureAD My Apps
https://account.activedirectory.windowsazure.com/r#/applications
MFA Personal User setup Page
https://aka.ms/mfasetup
https://account.activedirectory.windowsazure.com/proofup.aspx?proofup=1
Administration Portal Links
Microsoft 365 Administration
https://admin.microsoft.com/
Azure Administration
https://portal.azure.com
Microsoft 365 Direct Administration Links
Azure InTune direct link
https://portal.azure.com/#blade/Microsoft_Intune_DeviceSettings/ExtensionLandingBlade/overview
Windows Store for Business
https://businessstore.microsoft.com/en-us/manage/dashboard
Exchange Online Admin
https://outlook.office365.com/ecp/
SharePoint Online Admin
https://tenant-admin.sharepoint.com/_layouts/15/online/SiteCollections.aspx
Teams Admin
https://go.microsoft.com/fwlink/?linkid=867439
Flow
https://admin.flow.microsoft.com
Search
https://admin.microsoft.com/Adminportal/Home#/MicrosoftSearch
OneDrive
https://admin.onedrive.com
Yammer
https://yammer.com/office365/admin
PowerApps
https://admin.powerapps.com
PowerBI
https://app.powerbi.com/admin-portal/
Dynamics 365
https://port.crm6.dynamics.com/g/manage/index.aspx
Power Platform (Dynamics 365 new)
https://admin.powerplatform.microsoft.com/environments
Microsoft CloudApp Security
https://go.microsoft.com/fwlink/?linkid=2058038
Microsoft 365 Compliance Center
https://go.microsoft.com/fwlink/?linkid=2058036
Azure Active Directory
https://go.microsoft.com/fwlink/?linkid=2058058
Azure AD Identity Protection
https://go.microsoft.com/fwlink/?linkid=2040456
Azure Advanced Threat Protection
https://go.microsoft.com/fwlink/?linkid=2040449
Azure Information Protection
https://go.microsoft.com/fwlink/?linkid=2058274
Azure Security Center
https://go.microsoft.com/fwlink/?linkid=2058247
Microsoft 365 Device Management
https://go.microsoft.com/fwlink/?linkid=2058037
Microsoft Cloud App Security
https://go.microsoft.com/fwlink/?linkid=2058038
Office 365 Security and Compliance Center
https://go.microsoft.com/fwlink/?linkid=2040385
Microsoft Defender Security Center
https://go.microsoft.com/fwlink/?linkid=2058035
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Craig Wilson 