Is restoring autocomplete cache data possible on Office 365 online exchange ?

I am considering migrating to office365 .
At issue is the backup and restore of Autocomplete cache data as is done in with the following method .https://www.msoutlook.info/question/backup-and-restore-autocomplete

I know this is possible with HOSTED exchange like rackspace.
My question is whether Office 365 exchange 3 online exchange is the same animal and can it be done there as well .
Andre PAsked:
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Vasil Michev (MVP)Connect With a Mentor Commented:
It always depends on the details, but in general yes, you will have issues with Outlook's name cache after migrating to another "backend". As I tried to explain above, the autocomplete entry is not simply the email address of the recipient, it contains the legacyExchangeDN value, Which will change after the move. Some of the migration methods can take care of this, but in general the autocomplete cache is not something you should rely on.

Here's an article that gives some more detail: https://www.experts-exchange.com/articles/9650/NDRs-and-the-legacyExchangeDN.html
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Vasil Michev (MVP)Commented:
Should work. But you will most likely have to clear the name cache after the migration, as the entries will still refer to the old mailbox location and will cause NDRs. So not really sure what value you will get from the backup process :)
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Andre PAuthor Commented:
i dont understand your response . What we are looking for is a memory of previously SENT TO email addresses
What does the old SENT FROM location have to do with it ?
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Vasil Michev (MVP)Commented:
Where exactly have I mentioned send from? The autocomplete cache contains more than just the email address of the recipient, carrying this information after migrating to a different mail system will most certainly cause you trouble. That is why it's usually recommended to actually clear the cache post-migration.

If you want them exported as actual email addresses, better use some EWS based script such as this one: http://gsexdev.blogspot.bg/2013/10/exporting-suggested-contacts-owa-auto.html
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Andre PAuthor Commented:
So you are saying (just so I understand) that if I simply backup and restore the autocomplete cache , then I type in Jo and Johnsmith@company.com comes up ..Then I send him and email .it will not work ?
I am looking for a solution where the back end gets moved and the front end works EXACTLY like before .
not with new contacts.   but with the existing contacts and the autocomplete email addresses for each user intact .
This is not possible ?
forgive me if I seem obtuse  Exchange is not my thing .
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Andre PAuthor Commented:
Also I am migrating from Exchange 2007 to Office 365 is this not exchange in the back end ? Am I not migrating to a newer version of the same system ?
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