Now, for a large percentage of environments, this is probably not an issue – but if you are like a recent customer of ours, you may have specifically disabled the use of MAPI-HTTP. What isn’t explicity called out as a pre-requisite however is that your Outlook client also needs to also be running in MAPI over HTTP mode.
Enable Modern Auth on the client side via a registry key.Enable Modern Auth on the Tenant side via a powershell command.Now, the process for enabling Modern Auth is very well documented in the above blog post, but the short version is: If you haven’t heard, Modern Authentication (aka ADAL), has now officially gone GA () – which means that if you are utilising Office 365 services, particularly Exchange Online, and Office 2013/2016 as your client, you should really be looking at enabling this functionality for your end users.įor those unfamiliar with Modern Auth, there are numerous benefits, but one of the most obvious for end users is it removes the need for the use of ‘save my credentials’ when signing into Exchange Online and provides a true SSO experience when combined with ADFS Federation.