Office 365 customers, known as tenants within the configuration, all share Microsoft’s global datacenter infrastructure, which is composed of hundreds of thousands of servers located all over the world.
Within the tenant, customer data is housed in a region, based on their location and settings, as shown from the drop-down box displays.
Microsoft replicates customer data automatically across at least two datacenters at any given time to minimize against losses during any failover.
When you choose a region, you can see what data is where (when at rest) between the zoomed view and the details in the right margin:
Microsoft operates over 100 datacenters globally and continues to open more datacenter regions for Office 365 for business services. That being said, not every datacenter is used to host Office 365 and its services, but they do add to the available capacity (storage) and other…