The Service Upgrade for existing customers to the New Office 365 platform has been marketed by Microsoft as a non-disruptive update. However, we’ve been hearing from partners/customers that in some cases, the update has required the reconfiguration of EVERY users Outlook profile. Here is some information to help solve the problem.
Important News Regarding the New Office 365 – Microsoft Update
Let us know if this is helpful or you need additional information. Thanks!