Office 365

Acronis True Image: Office 365 backup fails with "login for the account to which the mailbox belongs is also used for another Microsoft account"

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

Acronis True Image 2019 and 2020: how to back up Office 365 accounts

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.

Acronis Cyber Backup 12.5: Office 365 protection

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.

Acronis Cyber Protect Cloud: O365 mailbox has "Not protected" status although Group Backup plan is applied

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.