This article applies to:
Office 365
Exchange hybrid
PROBLEM
You have moved a mailbox from Exchange on-premise to Exchange Online in Office 365 but you need to roll it back.
A typical scenario is when it turns out that you have an older 3rd party application which needs to access the content of the mailbox, but the application itself is not Office 365 compatible.
SOLUTION
If your Exchange organization is in hybrid mode it is quite easy to bring the mailbox back.
In Exchange Online admin center, under migration select the plus sign to create a new migration job and select Migrate from Exchange Online
Select the mailbox or mailboxes you want to migrate from Office 365 to your local Exchange Server.
Select the Exchange proxy server which will handle the migration job
Give the migration job a name and fill in options as shown.
Select to automatically start and complete the migration job.
Your migration job will show up in the migration job list.
Since we have chosen to automatically complete the job, as soon as the mailbox content is synchronized your mailbox will be switched to the old Exchange on-premise environment.
He lives in Zurich, Switzerland and is a dedicated specialist, with 30 years of professional work experience in IT.
Before starting Exchangemaster GmbH he worked as a system engineer and project manager with customers of all sizes and across many industries: From small ISV startups and a NGO humanitarian organizations up to largest international corporations like Stryker, Swisscom, British Telecom and Nyrstar.
He spent his entire career delivering Microsoft based infrastructure solutions with main focus on Active Directory and Exchange. During those years, he collected a valuable work experience on 8 Exchange generations (2019, 2016, 2013, 2010, 2007, 2003, 2000 and 5.5) and has delivered services to a user base of more than 3.2 million mailboxes in on-premise, hybrid and Office 365 deployments.
Beside working on customer projects, he is a regular speaker and expert at Microsoft conferences and user groups. As a Microsoft Certified Trainer he also teaches Microsoft Official Curriculum courses to technical professionals around Europe.
For his work he has received numerous awards.
In 2005 he was the first member to be elected into the MCP Hall of Fame by Windows IT Pro Magazine readers choice (as 1 of 6 worldwide).
From 2005-2017, Dejan has been awarded by Microsoft Corporation with the yearly Microsoft Most Valuable Professional award in area of Exchange for 12 years in a row (one of approximately 100 worldwide and, at the time, the only 1 such in Switzerland).
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