two companies exchange in the same Tenant

[ali ali]

llo Experts ,

our Company A.COM buy a new Company B.NET.there are no trust between the two domains.the Company A has a office 365 subscription ( Tenant )  with Hybrid Exchange 2016 .we have a request to styudy it is possible to migrate the Exchange of the Coimpany B to the Tenant of the company A .

My Questions are :

1-is the trust is necessary for this case or not (  just open some Flows ..) ?

2-  if the migration is possible ,  is there a way to delegate administration of the exchange online of the company B and the administrator for the company B can not make any changes for the company A ressources in O365 

Regards

[#2]

The trust is only required if you want to use ADFS.

The delegating is more difficult as you are going against the grain of the rbac model

[#3]

What you can do is sync the users from both on-premise Active directories to AzureAD. When this is done you can use a minimal hybrid (if im right) to start migrating. Also check this technet article.

https://technet.microsoft.com/en-us/library/jj873754(v=exchg.150).aspx