You must do this with elevated permission, as you cannot edit files in a standard Notepad window that reside in the Windows directory. To do this, you need to first launch Notepad from the Start Menu or the shortcut you have pinned to the Taskbar. The workaround that you can put in place to get the Outlook 2013/2016/2019 profile to set up with the correct mailbox is to add a host file entry to the local hosts file on an end-user’s machine. I have also seen this error when customers migrate from on-premises Exchange - it can be 2007 or 2010 - to a hosted platform on Exchange 2016 or 2019 using MigrationWiz. Your account sets up with the correct mailbox on Exchange 2016, and you get the auto-discover record popup. What I have found is if a customer moves to a hosted Exchange 2016/2019 solution but does not have an Office 365 tenant, you do not experience the challenge above. You will also notice there was no auto-discover popup to accept and then tick the box to not remind you again. The challenge (I would not say problem as it has a workaround) is that when you have entered your credentials as I mentioned above and Outlook opens, you will notice it shows your domain like instead of Do you see what happened here? Your credentials were accepted, but it took you to your Office 365 mailbox and not your on-premises Exchange 2016 mailbox. Outlook defaults to Microsoft 365 version: Wrong domain Logging into Outlook on the Web (also known as OWA), I get the login page (shown below) and can log in fine without an error. Not complicated at all, right? Externally everything is resolvable and I can set up my mobile device with my Exchange 2016 account and all works fine. In DNS, I have my auto-discover record defined to point to my on-premises Exchange 2016 servers and all my URLs are defined to use. Is Outlook connected without error? Let’s dive deeper, using my domain as an example, which is “.” And you should be prompted for your auto-discover information - accept it, and then your mailbox opens and sets up for the first time and all your mail downloads. When you launch your Outlook client, whether it is Office 2016 or 2019 or the Office 365 version of Outlook, you are prompted for your credentials, which is normal when you set up an account. Well, in the case where you have this kind of setup, it can cause some disruption in setting up Outlook client profiles when Outlook defaults to the Microsoft 365 version.Īre you wondering what I am talking about? Let me explain. You would assume that everything should work right. Many organizations today have on-premises Exchange 2016 or Exchange 2019 servers that have a hybrid connection to Microsoft 365, or, as it used to be called, Office 365.
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