
Manually configure Outlook – To manually configure Outlook to connect to Exchange Online, follow these steps:ġ. Determine the mailbox server name and the proxy server URL. If you occasionally hit an issue where your Outlook client will not auto-configure, the following steps should allow you to manually set it up: We don't feel that this change in behaviour represents the best interests of our customers, or other on-premise solution customers that use Microsoft Exchange.How to Manually Configure Outlook for Office 365 The fix should now be applied, next time you open Outlook it should take this into account and not query Office365 for the autodiscover process, and simply set up the hosted exchange mailbox instead. You'll want to now select the Autodiscover folder, and right-click on the empty space in the right-hand side to create a new DWORD key - the property should be ExcludeExplicitO365Endpoint set to a value of 1.Ĥ. HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\AutoDiscoverģ.

Navigate using the arrows on the left-hand side to the following location: Close Outlook, then open up a program called Registry Editor by pressing the windows icon and typing in simply regedit.Ģ. Please note, we cannot assist in any issues resulting from a misconfiguration, nor can we physically do this for you.ġ. We highly recommend backing up the registry before you modify it. Therefore, please ensure that you follow these steps carefully. However, serious problems might occur if you modify the registry incorrectly. The resolution requires you to modify the registry. This behaviour breaks the experience for both existing profiles, and newly created profiles - fortunately we have discovered a workaround involving a registry fix, for which the steps will be detailed below. Outlook prompts the user to log in, but logging in will fail as it's effectively requesting credentials to authenticate against the O365 service, rather than Hosted Exchange credentials. This causes problems for customers who aren't using O365 for their mail service (our Hosted Exchange customers), especially if the user has an unused mailbox within the O365 service, or if the the user has a personal O365 subscription using their business email address.

A recent update by Microsoft to the Outlook 2016 Click2Run version has introduced a functionality change whereby Outlook is prioritising Office 365 for the autodiscover queries above all other autodiscover methods.
