In some cases Active Directory may not include Exchange attributes that are required to change some settings on Office 365 when a user is synced with Active Directory. In order to add those attributes the Active Directory Schema must be extended to include Exchange attributes. For example, the HiddenFromAddressListsEnabled setting in Office 365 cannot be set from Active Directory unless the msExchHideFromAddressLists attribute is present. NOTE: After the extending the AD Schema the msExchHideFromAddressLists setting will not sync unless the mailNickname attribute in AD is also set.

The process below will only extend the schema and Exchange is not fully installed.

To extend the AD Schema in Active Directory follow the steps below. In our example our Active Directory server is Server 2012 R2 and we are using the Exchange 2016 setup files. If you are using an older server, such as Server 2008 R2, you may have to use the Exchange 2013 setup files which can be found in a link below.