O365 Tenant to Tenant Migration - Keeping same domain name

Hi Experts
We are in process of migrating SMTP domain along with users from one O365 Tenant to another
We are doing this with 3rd party tool call MigrationViz from BitTitan

We have users in o365 with mailboxes ranges from 1 GB to 30GB
The tool will migrate data from one tenant to another in cloud
The source tenant is not integrated with active directory. All identities are cloud only. They are not even using Dirsync
The target tenant having full functional Adfs and Dirsync

Problem:
Once tenant get changed we have to reconfigure outlook profile.
Is it possible to retains users existing OST file so that after profile repair / change it will pick existing OST
We don't want to download entire mailbox as OST again on client workstation
As per Microsoft, we have to reconfigure entire outlook profile and this will create new OST file.

Is there any way so that we can retain and use existing OST?
Because nothing will change except Tenant
User SMTP domain, email address, autodiscover settings everything will remains same

Any pointers are really appreciated

Thanks
Mahesh
LVL 42
MaheshArchitectAsked:
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Vasil Michev (MVP)Commented:
You can try mapping the old OST after creating the new profile by using the ForceOSTPath key. Pretty much the method described here: https://support.microsoft.com/en-us/kb/2752583
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MaheshArchitectAuthor Commented:
Thanks Vasil

The article I think applies to all outlook versions, I have to check that.

However is it possible to just repair existing outlook profile from account settings instead of reconfiguring new profile and it will pick all settings of new tenant due to autodiscover?
Because everything remains same except tenant.
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Jian An LimSolutions ArchitectCommented:
no, you can't

Regardless what others says, it is not supported.
The reason why is the OST will be re-created because your mailbox GUID is different.

Unless microsoft allows you to create a mailbox GUID which is identical (talk to migrationwiz, you might find something as they are developing something the last time i heard), user will have to redownload the email again.

a new tenant means everything new.
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MaheshArchitectAuthor Commented:
Thank You very much
You hit the nail.
Much appreciated, straight forward answer.
Got same answer from Microsoft
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