Reduse Mailboxes Size Exchange 2016

Hello Experts,

Im on my way to migrate some mailboxes to Office 365 from Exchange 2016 on premise server, since the mailboxes sizes between 20 to 40 Gb also the bandwith is very slow, so im just looking if someone tell me what is the best way of archiving those mailboxes for windows and Mac users and if there is any differenses, also i just need to confirm if the in-place archive feature available on the Exchange 2016 standard or not because as per Microsoft it requires enterprise cal but i tried to enable it for some users and found no issues but still didnt check the results.

Many Thanks.
Abdul AliAsked:
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Vasil Michev (MVP)Commented:
Microsoft is not enforcing the need for Enterprise cal, thus the observed behavior. It leaves you in a situation where you are violating the license agreement though, so I wouldnt recommend doing this. And as is the case with any licensing related issue, best talk about it with your local MS guys.

What kind of migration are looking at? There are some third party tools that can "trim" the mailbox, as in migrate only data from say the last year.
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Abdul AliAuthor Commented:
Thanks Vasil for reply, its a Hybrid migration. And i was actually looking if there is a free Microsft solution that can do that except the third party tools.
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Abdul AliAuthor Commented:
So what about autoarchiving feature in outlook? is it suffecient for that step also if i use it does it will remove the archived emails from the exchange server to reduse the size or it will keep a copy?
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Vasil Michev (MVP)Commented:
You can export some of the content to a PST file if that's what you mean. Question is how are you going to handle the PSTs later on? The general consensus is they should be avoided where possible.
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Abdul AliAuthor Commented:
You mean accessing those arhcived data from Office 365 after migration right?  if yes we cant import that PST file later on outlook to be uploaded on the office 365 server?
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Vasil Michev (MVP)Commented:
You can, it's simply something people want to avoid.
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Abdul AliAuthor Commented:
Thanks for the advise Vasil, but i tried to test archivng one of the exchange on premise and the mailbox size is redused, but when tried to migrate it to office 365 it takes the old size of the mailbox before archiving, so just wondering why it didnt just migrate or upload the small size affter archiving? because if i will upload the same size there no purpose of doing that archive.

thanks.
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Vasil Michev (MVP)Commented:
If you mean "Online archive" that's the expected behavior. If you have auto-archived/exported to PST/removed the content from the mailbox, the size should be reduced.
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Abdul AliAuthor Commented:
Yes i used  the autoarchive option in outlook and archived the PST locally, and the mailbox size redused as i mentioned but when migrating that mailbox  to office 365 the batch mentioning that its upload the old big size before archiving which is weird for me, so im just wondering if that normal or not?
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Abdul AliAuthor Commented:
Yes i used  the autoarchive option in outlook and archived the PST locally, and the mailbox size redused as i mentioned but when migrating that mailbox  to office 365 the batch mentioning that its upload the old big size before archiving which is weird for me, so im just wondering if that normal or not?
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Vasil Michev (MVP)Commented:
Doesnt look normal to me. Did you make sure the archived data is removed from the Deleted Items/Recover deleted items containers too?

Perhaps you have the mailbox on hold, thus data is preserved?
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Jackie ManCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

Accept: Vasil Michev (MVP) (https:#a42046731)

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