Change primary email address with PowerShell - Active Directory FAQ
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Office 365:Change Primary Email address of Active Directory User
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Changing the primary email in a hybrid Office365 local AD deployment - IT(jon)
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knowledgebase - Email address required
Office 365:Change Primary Email address of Active Directory User
POWERSHELL ACTIVE DIRECTORY: ADD OR UPDATE PROXYADDRESSES IN USER PROPERTIES ATTRIBUTE EDITOR | vGeek - Tales from real IT system Administration environment
Quantum Software Solutions - Knowledge Base - FAQ: How do I add additional email addresses for a user in Active Directory?
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Popolamento di UserPrincipalName di Azure AD - Microsoft Entra | Microsoft Learn
Exchange Online: Add a Secondary E-Mail Address to a Synchronized Account | Interface Technical Training
Finding Duplicate SMTP Addresses
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Exchange Proxy Address (alias) Report | Mike Crowley's Whiteboard
Using AD to Add an Alias to an Office 365 Email Account
Find email addresses with PowerShell - ALI TAJRAN
Exchange Proxy Address (alias) Report | Mike Crowley's Whiteboard
Soft (SMTP) vs. Hard (immutableID) matching with Azure AD Connect - ITProMentor