The question in my previous blog post was “Can we decommission our Exchange servers after moving to Office 365?” and the blunt answer was “No, you cannot decommission your last Exchange server on-premises”.
In this previous blog post I showed you what happens if you synchronize a user to Azure Active Directory from your on-premises Active Directory, and how to create a Mailbox in Exchange Online with a proper primary Email address. At the same time, it was only possible to set only one Email address, and there’s no possibility to add multiple Email addresses, nor is it possible to change any other Exchange related setting.
In this blog post I’ll discuss how to extend Active Directory with Exchange attributes to unleash more functionality and management options in Exchange Online. Please note that the solution in this blog works fine, but it is not recommended and not supported by Microsoft. Continue reading Office 365 Directory Synchronization without Exchange server Part II