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DiasDT-8403 avatar image
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DiasDT-8403 asked EUSTAQUIOMendesGuimaraes-2565 answered

Migration from Zimbra to o365

Hi Sirs,

We have one mail server zimbra, and want to migrate some users from Zimbra to o365.
We could migrate for example 10 users from zimbra to o365 (by imap migration, csv etc) assigned licenses.
As far as I know in order they (migrated users) could work on o365 completely we have configure dns settings on domain which we selected as default EAC. If we add the records which are required, the zimbra wouldn't start work properly. But we want to keep both servers as online. What should we do in further in order both servers could send email to each other (send\receive from\to internal\external emails)
If sender (doesn't matter if he external or user zimbra) send an email to the user o365, email anyway comes to zimbra server.
Hope I could explain the situation.

Thank you!

office-exchange-server-administrationoffice-outlook-itpromicrosoft-365-apps-publishing-dev
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Hi @DiasDT-8403

Do suggestions below help?

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joyceshen-MSFT avatar image
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joyceshen-MSFT answered DiasDT-8403 commented

Hi @DiasDT-8403

That's the expected behavior you described above. If you point the MX record to O365, this helps ensure that email is delivered to your Microsoft 365 or Office 365 mailboxes. Moving the MX record will also let you turn off your old email system when you are ready.

So if you want to keep both mail servers and want them able to send mails to each other, keep the MX record to your source server and for the users migrated to o365 already, sending mails to them by using .onmicrosoft.com addresses

For more information: Why do I have an "onmicrosoft.com" domain?


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Hi @joyceshen-MSFT

Yes, I tried to add MX record of O365, and faced with the problem incoming email to old server, and noticed that o365 by default requires priority 0. The only solution is to migrate all users to O365 and add MX record. As temp solution is as you said onmicrosoft.com , I used forward from Zimbra to O365, and in case if user will send email to onmicrosft.com forward from onmicrosft,com to zimbra using Contact on exchange. And enabled external forwarding whoch is disabled by default.

Thank you,
D

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EUSTAQUIOMendesGuimaraes-2565 avatar image
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EUSTAQUIOMendesGuimaraes-2565 answered

I have the task of migrating EVERYTHING from the boxes.
Messages, calendars (all), contacts, groups etc.
I can't work with IMAP ONLY.
Has anyone managed to migrate the other objects?

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