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Exchange 2013 Inherited Permission for Every Mailbox

Recently I found out that my individual account was given FULLACCESS permission on every mailbox in Exchange. What was strange was that the permissions were INHERITED and had a DENY=TRUE on them.

How in the world did that happen? Also, how do I fix it?

I traced it back to permissions in AD on the Exchange Service:

dsacls "CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=domain-name,DC=tld"

Also it was here:

dsacls "CN=COMPANY-NAME,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=domain-name,DC=tld"

So it must have happened durning an Exchange CU upgrade. More specifically during the Prepare Active Directory schema:
setup.exe /PrepareSchema
setup.exe /PrepareAD

To remove:
dsacls "CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=domain-name,DC=tld" /R DOMAIN\Account

 Or you can open ADSI > CONFIGURATION > SERVICES > MICROSOFT-EXCHANGE

  • -rigth-click > PROPERTIES
  • -click SECURITY tab (at the top).

If needed, you can look further down:

ADSI > CONFIGURATION > SERVICES > MICROSOFT-EXCHANGE > COMPANY-NAME > ADMINISTRATIVE-GROUPS > EXCHANGE-ADMINISTRATIVE-GROUP > SERVERS > SERVER-NAME

  • -rigth-click > PROPERTIES
  • -click SECURITY tab (at the top).
  • -click ADVANCED

Look for the account and it will show where the inheritance is coming from.

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