Migrate Sharepoint Online to a new Office 365

Question

A client A has an existing Sharepoint Online and a client B hasn't. They want to merge into a new domain Office 365.

So, it is possible to migrate an existing Sharepoint Online to a new one included in a new Office 365 domain ?

I only find information about Sharepoint on premise to O365. What about Sharepoint Online ?

Answer 1

There is no OOTB/simple way to move the site collection in the Office 365. I am thinking two possible way.

Option 1

You are able to manually save the sites as the templates and import to the new tenant as a workaround, it will not break the files and the structure in a site except the permissions.( One thing, if your site collections is publishing then you have to turn off the publishing feature before performing the steps.) For details, please check this.

Moving SharePoint sites

Option 2

Think about the 3rd party tools, all supported from Office 365 to Office 365 move (i.e sharegate, metalogix etc. They have trial version as well.)