Office 365

You run a backup of Microsoft Office 365 mailbox and/or OneDrive with Acronis True Image 2019/2020
Backup fails with the following error:

Cannot back up this mailbox because the login for the account to which the mailbox belongs is also used for another Microsoft account

Introduction

Starting from Acronis True Image 2019 Update 2 (Build 14610) you can back up OneDrive and mailboxes for MS Office 365 Consumer accounts. Backups are saved to Acronis Cloud. You need Acronis True Image Advanced or Premium subscription to use this feature.

Comparison of Office 365 protection options in on-premises deployment and Cloud deployment of Acronis Cyber Backup 12.5. To learn more about on-premises and cloud deployment see product documentation.

(!) The table describes features available in Update 3 (Build 11010) and later. Some features are unavailable in earlier builds.

Symptoms

Office 365 mailbox has Not protected status although a group backup plan is applied.

Cause

Issue happens because currently C2C agent does not perform backup of O365 mailboxes that do not have a valid license.