(solved) Help using MS365 Enterprise (AD joined W10 & Outlook 365) with non Microsoft Cloud Exchange (2013) ?

asked 2021-04-27T09:06:42.7+00:00
Romain B 96 Reputation points

Hello,

I recently installed 2 new computers under our new MS Azure infrastructure, Azure AD Joined.
Those computers are configured to allow Azure users to authenticate to computer.
We have O365 E5 licences for the accounts, but we are not using Microsoft O365 email.

It is a real nightmare to make Outlook (by default, last 365 version 2103 build 13901... click to run) with our Exchange Server that we have in the cloud (version 2013). Finding the good way to make outlook not configure the O365 email and configure the Exchange server is tricky.

We succeed to configure Outlook, it start in "Exchange mode", but after synchronised correctly, outlook stop sync, and warn saying that mailbox been temporarily moved on Microsoft Exchange Server, showing the 0365 mailbox of user account (that is useless) if user choose "Use Temporary Mailbox", of local mail downloaded if user select "Use Old Data"...

I think I have 2 issues:

  1. need to disable O365 MailBoxes somewhere to avoid Outlook to autoconfigure with 0365 mailbox
  2. reconfigure DNS to make Outlook 2016 work properly with our Exchange server in the cloud.

if someone knows where I can find guidance on this kind of setup ?

I have run a Outlook Connectivity check,
it does not say bad things from my point of view...

I also found this post close to our issue but not similar 100%, I did not found solution.
https://social.msdn.microsoft.com/Forums/en-US/178080f9-17a7-4465-882e-1d027d846e1a/outlook-20162013-not-able-to-connect-to-exchange-2013-from-external-or-nondomain-pc?forum=exchangesvrsecuremessaging

Outlook Management
Outlook Management
Outlook: A family of Microsoft email and calendar products.Management: The act or process of organizing, handling, directing or controlling something.
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