Veeam for Microsoft 365 Invalid Serialized Stream, Unknown Opcode Found:4 error
A recent Microsoft change to the Serialized Property of Exchanges items have caused “Invalid ‘serialized stream, unknown opcode found: 4’” errors across Veeam for Microsoft 365 users. This issue has been resolved with new hotfixes for users on versions 7.0.0.4551 and 7.1.0.1401. Below are the KB links to download the hotfix that pertains to your environment: Hotfix for 7.0.0.4551 P20231218 Hotfix for 7.1.0.1401 P20231218 To install the hotfix, follow these quick steps: If you continue to experience the error, would like assistance with the hotfix, or have any other backup replated questions, please reach out to Support@Managecast.com.
