Merging Office365 companies

I have four companies that are merging and want to merge their office365 accounts. They want to be able to see the same share point folders and see the status of employees in each organization (available, offline, etc...). Also two of the companies have exchange online two use google docs. How can I get all 4 onto one exchange online that can be centrally managed?

This is all simple in my mind but I may not be explaining very well. Any help is appreciated.
clifford_m71IT ManagerAsked:
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Adam BrownSr Solutions ArchitectCommented:
You will need to either create a new tenant or select one of the existing tenants to be the primary. You will not be able to easily migrate data from O365 to a separate O365 tenant without third party utilities. MigrationWiz can help with this. Moving from GSuite to O365 is also best accomplished with a third party migration tool, since Google's calendaring and other features tied to GMail do not utilize open standards. If you want to avoid exporting and importing ICAL data manually, get a third party utility. It will save you significantly more in time than the cost per user.
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CodeTwo SoftwareSoftware DeveloperCommented:
I agree with Adam on this one - you will need to start a migration project and as there are no reliable native means of doing so, you will need a third-party migration tool. You can use CodeTwo Office 365 Migration. It allows you to migrate mailboxes between Office 365 tenants, as well as, from G Suite to Office 365. To see the all its features and get a free trial, visit CodeTwo Office 365 Migration website.
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Sandeep KumarAssociate ConsultantCommented:
Yes, It is as simple as in your mind, Clifford. By using Kernel Migrator for Exchange software, you can swiftly migrate Office 365 to Office 365 tenant migration in few steps. It can migrate all emails, contacts, calendars etc and also supports Public and hosted Exchange to cloud Office 365 migration. To know more about Exchange Migration tool, visit https://www.nucleustechnologies.com/exchange-migration/office-365-migration.html and download the demo software.
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Sara TeasdaleCommented:
Learn how Migration Manager for Exchange is an efficient exchange migration and management tool allowing for easy consolidation of your exchange environment.

https://www.quest.com/products/migration-manager-for-exchange/

https://softcart.wordpress.com/migrator-for-ms-exchange/
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clifford_m71IT ManagerAuthor Commented:
Thank you for the ideas everyone. I'll have to investigate each (Any of you happen to be sales reps for these packages?? ;)

One more question. If a user has individual email addresses for each of these domains (tenants) is there a way for them to login to a single tenant and see all mailboxes?
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CodeTwo SoftwareSoftware DeveloperCommented:
If you have any CodeTwo software related questions, feel free to send me a message.
If a user has individual email addresses for each of these domains (tenants) is there a way for them to log in to a single tenant and see all mailboxes?
Before the migration, it is not possible. After the migration - it is, and you have more than one option to do so. You could migrate all those individual mailboxes to a single mailbox in the target tenant. Or migrate those accounts separately and give the user full access permissions to the rest of mailboxes.
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