Hello All, I'm having an issue with my OAB folder security permissions in the Client Access folder. Basically every time the Exchange File Transfer service is restarted or updates itself the "Authenticated Users" permission gets automatically removed. This is causing an issue where I am unable to download the OAB to Outlook clients. Does anybody know how I can add the Authenticated Users permission permanently so that the File Transfer service will no longer remove the permission? Any help would be greatly appreciated.

Found another article that helped me solve this issue. Had to run the following cmdlets in shell: $oab1 = Get-OfflineAddressBook OAB1 > $oab1.DistinguishedName CN=OAB1,CN=Offline Address Lists,CN=Address Lists Container,CN=First Organization,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=FAFYFJ-dom,DC=extest,DC=microsoft,DC=com > $container = "CN=Offline Address Lists,CN=Address Lists Container,CN=First Organization,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=FAFYFJ-dom,DC=extest,DC=microsoft,DC=com" > get-adpermission $container -user "NT AUTHORITY\Authenticated Users"| where {$_.ExtendedRights -match 'ms-Exch-Download-OAB'} |fl > add-adpermission $container -user "NT AUTHORITY\Authenticated Users" -ExtendedRights 'ms-Exch-Download-OAB'