Forum Discussion
Your mailbox has been temporarily moved after directory synchronization
Ok, I defintely found the problem due to Direct Connect in Outlook 2016 (source https://www.gothamweb.com/portal/index.php/knowledgebase/8/Outlook-bypasses-AutoDiscover-and-connects-directly-to-Office-365-mailbox.html )
Starting in Outlook 2016 version 16.0.6741.2017, Microsoft has enabled a new feature called Direct Connect to Office 365. What this feature does is connect Outlook directly to Office 365 if Autodiscover is not working. This is great feature but a network hiccup may cause your mailbox to connect to Office 365 rather than your on premise Exchange, even with a valid autodiscover record.
For Direct Connect to take effect the user must have an active mailbox on Office 365 with a valid license. Typically Direct Connect would be a neat feature unles you are in the middle of a migration to 365, but a network hiccup could incorrectly connect you to 365 even though you havent completed your migration yet.
During 365 migrations deom Hosted Exchange or On-Premise, we recommend disabling this option from the user computer registry:You can stop Outlook from checking Office 365 for settings by setting a registry key.
HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\office\16.0\outlook\autodiscover DWORD: ExcludeExplicitO365Endpoint Value = 1
Well, I found with network analysis, Outlook 2016 (ProPlus) try autodiscover, and if doesn't work, Outlook try Office 365 autodiscover. For example, if my server goes down for minutes and I launch Outlook, Outlook goes to Exchange Online... and I have to recreate another profile.
It is very annoying and counterproductive
I am in the middle of migration, so I have already accounts synchronized.
What is the purpose of doing that ?
Ok, I defintely found the problem due to Direct Connect in Outlook 2016 (source https://www.gothamweb.com/portal/index.php/knowledgebase/8/Outlook-bypasses-AutoDiscover-and-connects-directly-to-Office-365-mailbox.html )
Starting in Outlook 2016 version 16.0.6741.2017, Microsoft has enabled a new feature called Direct Connect to Office 365. What this feature does is connect Outlook directly to Office 365 if Autodiscover is not working. This is great feature but a network hiccup may cause your mailbox to connect to Office 365 rather than your on premise Exchange, even with a valid autodiscover record.
For Direct Connect to take effect the user must have an active mailbox on Office 365 with a valid license. Typically Direct Connect would be a neat feature unles you are in the middle of a migration to 365, but a network hiccup could incorrectly connect you to 365 even though you havent completed your migration yet.
During 365 migrations deom Hosted Exchange or On-Premise, we recommend disabling this option from the user computer registry:
You can stop Outlook from checking Office 365 for settings by setting a registry key.
HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\office\16.0\outlook\autodiscover DWORD: ExcludeExplicitO365Endpoint Value = 1
