How to renew OAUTH SSL Certificate in Exchange

Open Exchange PowerShell on the Exchange server

Run the following command (replace *.domainname below with the domain name)

New-ExchangeCertificate -KeySize 2048 -PrivateKeyExportable $true -SubjectName “CN= Microsoft Exchange Server Auth Certificate” -DomainName “*.domainname” -FriendlyName “Microsoft Exchange Server Auth Certificate” -Services SMTP

Answer No to over-write

Write down the certificate thumpprint

Type:

$date = Get-Date

Type:

Set-AuthConfig -NewCertificateThumbprint <certificate_thumbprint> –NewCertificateEffectiveDate $date

Substitute <certificate_thumbprint> above with certificate thumpprint that you wrote down.

Confirm Y

Type:

Set-AuthConfig –PublishCertificate

Type:

Set-AuthConfig -ClearPreviousCertificate

Restart the Microsoft Exchange Service Host service

Restart IIS
IISReset