I presume that each newly created Org. by default is allowed 2 seats (if no LTD code is applied). Is this a correct understanding?

Coming back to the previous Q., in a given account - what is the maximum Orgs. (with 2 default user seats) could we create? Is it unlimited?

Question 2:

For these multiple Orgs. that we created under the same account, are these Orgs. fully isolated from each other?

i.e. is there an iron wall between the Org1-user1 and Org2-user2? or can those users see and peek into each other chat rooms and chat history etc?

For e.g. let's say Microsoft created the master account. And then underneath the master account, it created an Org. for Office-team, and second Org. for Windows-Team, and a third Org. for Azure-team.

What kind of firewall exists today between these three orgs, and the users logging into the three respective Orgs.

Please part with your guidance. We're looking to buy multiple pro accounts. Your response will be a major factor in our decision if to buy your SAAS service or a few other options we are looking at.