[stlord]

You have to restore permission using DSACLS
Example:
First, check your permission using the command line without parameters ( / stuff)
Optionally, you can remove inheritance from it’s parents objects using /P:N
dsacls “CN=Mailbox Store (SERVERNAME),CN=First Storage
Group,CN=InformationStore,CN=SERVERNAME,CN=Servers,CN=First Administrative
Group,CN=Administrative Groups,CN=DOMAIN,CN=Microsoft
Exchange,CN=Services,CN=Configuration,DC=domain,DC=domain” /R Everyone
And Then
dsacls “CN=Mailbox Store (SERVERNAME),CN=First Storage
Group,CN=InformationStore,CN=SERVERNAME,CN=Servers,CN=First Administrative
Group,CN=Administrative Groups,CN=DOMAIN,CN=Microsoft
Exchange,CN=Services,CN=Configuration,DC=domain,DC=domain” /G Everyone:GA

Replace SERVERNAME and DOMAIN with what applies to your server, and DC=domain,DC=domain will be e.g . DC=microsoft,DC=com