Due to limitations and functional issues with (Messaging Application Programming Interface) MAPI backup mode, which is a Microsoft technology used by CloudBacko Pro to enable MS Exchange Server 2013 mail level backup and restores, we have to terminate the support for mail level backups using MAPI Protocol on MS Exchange 2013 Cumulative Update 23 or above. It is because starting from Microsoft Exchange 2013 Cumulative Update 23 or above MAPI backup mode may stop working properly. To avoid issues with Microsoft Exchange 2013 mail level backup and restores, it is strongly recommended to transition from MAPI backup mode to (Exchange Web Services) EWS backup mode as soon as possible.
If CloudBacko Pro continues to use MAPI backup mode and MS Exchange Server 2013 is updated to Cumulative Update 23 or above. This will result in the following outcome:
Furthermore, MAPI backup mode is not fully functional after MS Exchange Server 2013 Cumulative Update 20 or above is applied, as MAPI is unable access Public Folder items from the MS Exchange 2013 database. This will result in the following outcome:
Please note after installation of the cumulative update 23 package, you cannot simply uninstall the package to revert to an earlier version of Exchange Server 2013. If you try to uninstall this cumulative update package, the entire Exchange Server 2013 installation will be removed from the server. https://support.microsoft.com/en-hk/help/4489622/cumulative-update-23-for-exchange-server-2013
This issue only affects backups currently running MS Exchange mail level backup set on MS Exchange 2013 Cumulative Update 20 to Cumulative Update 23 or above using MAPI backup mode. To check the MS Exchange 2013 version and build number, use the Get-ExchangeServer cmdlet found in the Exchange Management Shell
Example: Get-ExchangeServer | Format-List Name, Edition,AdminDisplayVersion
|Product Name||Build Number|
|MS Exchange Server 2013 CU23||15.00.1497.002|
|MS Exchange Server 2013 CU22||15.00.1473.003|
|MS Exchange Server 2013 CU21||15.00.1395.004|
|MS Exchange Server 2013 CU20||15.00.1367.003|
Please refer to this Microsoft article for details of MS Exchange build numbers and releases:
As backup sets using MAPI backup mode cannot be directly converted to EWS backup mode. A new backup set using EWS backup mode must be created.
The transition will result in the following outcome:
The transition from MAPI to EWS backup mode will involve: