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


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.

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Senior IT System EngineerIT ProfessionalAsked:
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Vasil Michev (MVP)Commented:
Hybrid is the way to go, unless you have some specific reason to avoid it?
Senior IT System EngineerIT ProfessionalAuthor Commented:

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.
Vasil Michev (MVP)Commented:
That depends on your compliance needs mostly. You can just dump the archives (and the EV content) in the Online Archive, and use the Microsoft tools (hold, eDiscovery), but some organizations continue to use EV. For some, this is because of legal reasons, for example features that were missing in Microsoft's implementation or are simply harder to do. Others simply dont like the fact that there isnt any point-in-time backup in O365 so again employ some sort of on-prem solution as well. But yes, if you are OK with dumping everything in the cloud, you should be able to save some $.

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Senior IT System EngineerIT ProfessionalAuthor Commented:
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.
Vasil Michev (MVP)Commented:
Well you can dump them in the on-prem archive mailbox, then move the whole archive to the cloud. There's no importing via PowerShell in EO. You can use the new Import tool to upload the PSTs or even ship the disks to MS datacenters (https://technet.microsoft.com/en-us/library/ms.o365.cc.ingestionhelp.aspx).

There are some 3rd party tools as well (Nuix, Transvault).

If you also have data for terminated employees, use the Inactive mailboxes functionality in O365 to save on some licenses: http://technet.microsoft.com/en-us/library/dn144876(v=exchg.150).aspx
Senior IT System EngineerIT ProfessionalAuthor Commented:
Thanks Vasil !
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