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Albert WidjajaFlag for Australia

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Migrating Microsoft Exchange 2010 & Symantec EV v10 to Office 365 steps and planning

People,

Can anyone here please share some tips and planning on what is the best way to migrate the existing On Premise:

Microsoft Exchange Server 2010 SP3 - 2 Mailbox Server, total 2800 users mailboxes 6.2 TB size total
Symantec Enterprise Vault Server v10 - 1 Archive Server, 8.8 TB size total

to Office 365 with Exchange Archiving E3 or E4 license ?

What do I need to setup and what is the best way to migrate those data to the cloud safely with minimal interruption to user email flow / access.

Thanks,
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Vasil Michev (MVP)
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Hybrid is the way to go, unless you have some specific reason to avoid it?
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Vasil,

Yes, but in my case here, what is the best way to migrate the archived email and the online email to the cloud safely without user downtime ?

The reason is that I do not want to manage the disk space anymore with emails, if you sum the number, it can save up to 15 TB+ of disk space when I can decommission Exchange Servers and the EV servers.
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Vasil Michev (MVP)
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Cool, so yes based on my understanding of how Exchange Online (O365) works is that there is no Backup API to recover email (or any mailbox object) that was deleted before it is archived by O365.

what are your recommendation to "dump" or migrate / upload the data from EV into Office 365 ?

I can only know how to export each archive as .PST and then import it manually using Powershell command.
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Thanks Vasil !