KB4325 release notes and known issues

Summary

Shared Server Compatibility of Veeam Backup for Microsoft 365 and Veeam Backup & Replication KB ID: 4325 Product: Veeam Backup & Replication | 12 | 12.1 | 12.2 | 12.3 | 13 | 13.1 Veeam Backup for Microsoft 365 | 8 | 8.1 | 8.2 | 8.3 | 8.4 | 8.5 | 8.6 Published: 2022-08-10 Last Modified: 2026-09-14 Purpose It is important to remember that Veeam Backup for Microsoft 365 and Veeam Backup & Replication are separate backup products designed to operate separately from each other. However, both Veeam Backup for Microsoft 365 and Veeam Backup & Replication utilize Veeam Explorers as secondary applications to perform application item restores. The Veeam Explorers are installed alongside either backup application. Due to this shared use of the Veeam Explorer applications, it is imperative that when both Veeam Backup for Microsoft 365 and Veeam Backup & Replication are installed on the same server, that only specific compatible versions be installed (see table below) . Failure to ensure compatibility could lead to a situation where one backup product may not be able to utilize the Veeam Explorer application installed by the other backup product, thus causing application item restores to fail. Solution When installing Veeam Backup & Replication (VBR) and Veeam Backup for Microsoft 365 (VB365) on the same server, be mindful of the following compatibility when upgrading. Note: As new versions of either product are released, they will be added to the table, and as versions reach End of Support , they will be removed. The release schedule of these products is not synchronized. If a version of either product is released before the compatible version of the other, it is critical to wait until inter-compatible versions are available. For example, if a new version of Veeam Backup & Replication is released and a compatible version of Veeam Backup for Microsoft 365 is not available yet, upgrading Veeam Backup & Replication would lead to the issue documented in KB3028 . Build Numbers and Versions of Veeam Backup & Replication Build Numbers and Versions of Veeam Backup for Microsoft 365 VBR13.1 VBR 13 VBR 12.1, 12.2, 12.3 VBR 12.0 VB365 8.6 [1] , [2] [1] , [2] [1] , [2] [1] VB365 8.5 [1] , [2] [1] , [2] [1] , [2] [1] VB365 8.4 [1] , [2] [1] , [2] [1] , [2] [1] VB365 8.3 [1] , [2] [1] , [2] [1] , [2] [1] VB365 8.2 [1] , [2] [1] , [2] [1] , [2] [1] VB365 8.1 [1] , [2] [1] , [2] [1] , [2] [1] VB365 8 [1] , [2] [1] , [2] [1] , [2] [1] This table lists only actively supported versions . Swipe to show more of the table 1 KB4638: How to Use Existing Veeam Backup & Replication PostgreSQL instance for Veeam Backup for Microsoft 365 Deployment 2 KB4639: Veeam Backup & Replication Install Fails with: "A later version of Veeam Explorer for Microsoft Exchange is already installed." If this KB article did not resolve your issue or you need further assistance with Veeam software, please create a Veeam Support Case. To submit feedback regarding this article, please click this link: Send Article Feedback To report a typo on this page, highlight the typo with your mouse and press CTRL + Enter.

Improvements and security content

• Shared Server Compatibility of Veeam Backup for Microsoft 365 and Veeam Backup & Replication KB ID: 4325 Product: Veeam Backup & Replication | 12 | 12.1 | 12.2 | 12.3 | 13 | 13.1 Veeam Backup for Microsoft 365 | 8 | 8.1 | 8.2 | 8.3 | 8.4 | 8.5 | 8.6 Published: 2022-08-10 Last Modified: 2026-09-14 Purpose It is important to remember that Veeam Backup for Microsoft 365 and Veeam Backup & Replication are separate backup products designed to operate separately from each other. However, both Veeam Backup for Microsoft 365 and Veeam Backup & Replication utilize Veeam Explorers as secondary applications to perform application item restores. The Veeam Explorers are installed alongside either backup application. Due to this shared use of the Veeam Explorer applications, it is imperative that when both Veeam Backup for Microsoft 365 and Veeam Backup & Replication are installed on the same server, that only specific compatible versions be installed (see table below) . Failure to ensure compatibility could lead to a situation where one backup product may not be able to utilize the Veeam Explorer application installed by the other backup product, thus causing application item restores to fail. Solution When installing Veeam Backup & Replication (VBR) and Veeam Backup for Microsoft 365 (VB365) on the same server, be mindful of the following compatibility when upgrading. Note: As new versions of either product are released, they will be added to the table, and as versions reach End of Support , they will be removed. The release schedule of these products is not synchronized. If a version of either product is released before the compatible version of the other, it is critical to wait until inter-compatible versions are available. For example, if a new version of Veeam Backup & Replication is released and a compatible version of Veeam Backup for Microsoft 365 is not available yet, upgrading Veeam Backup & Replication would lead to the issue documented in KB3028 . Build Numbers and Versions of Veeam Backup & Replication Build Numbers and Versions of Veeam Backup for Microsoft 365 VBR13.1 VBR 13 VBR 12.1, 12.2, 12.3 VBR 12.0 VB365 8.6 [1] , [2] [1] , [2] [1] , [2] [1] VB365 8.5 [1] , [2] [1] , [2] [1] , [2] [1] VB365 8.4 [1] , [2] [1] , [2] [1] , [2] [1] VB365 8.3 [1] , [2] [1] , [2] [1] , [2] [1] VB365 8.2 [1] , [2] [1] , [2] [1] , [2] [1] VB365 8.1 [1] , [2] [1] , [2] [1] , [2] [1] VB365 8 [1] , [2] [1] , [2] [1] , [2] [1] This table lists only actively supported versions . Swipe to show more of the table 1 KB4638: How to Use Existing Veeam Backup & Replication PostgreSQL instance for Veeam Backup for Microsoft 365 Deployment 2 KB4639: Veeam Backup & Replication Install Fails with: "A later version of Veeam Explorer for Microsoft Exchange is already installed." If this KB article did not resolve your issue or you need further assistance with Veeam software, please create a Veeam Support Case. To submit feedback regarding this article, please click this link: Send Article Feedback To report a typo on this page, highlight the typo with your mouse and press CTRL + Enter.

Affected products and versions

Recommended action

Review the official publisher document before deployment.

Official publisher evidence