As you know, Microsoft continuously opens new datacenter regions for Office 365 for business services. The new datacenter regions offer in-region data residency for core customer data. Core customer data is a term that refers to a subset of customer data defined in the Microsoft Online Services Terms: Exchange Online mailbox content (e-mail body, calendar entries, and the content of e-mail attachments) and SharePoint Online site content and the files stored within that site.
Existing customers that have their core customer data stored in an already existing datacenter region are not impacted by the launch of a new datacenter region. It mean’s, that those many Canadian companies, who already use Office 365, still have their data in US datacenters.