When running the Update Checksum for Emails tool on cases created in v9.5.x or earlier, the process is completed as a partial success.
Examining the scan_failed_items.csv file in the location referenced in the job status log, MS-Office products such as Excel, Powerpoint, Word and Outlook items show the error "FAILED: Unknown error scanning mail file.
The PstRetriever_Output.log in \\CW\V10.x.x\logs contains the error:
EsaError: 15005 WinError: 0x80004005 Unspecified errorhRes: 0x80004005 [MAPI_E_CALL_FAILED] AND //./PIPE/EsaPSTRetrieverBinaryOutputPipe
A 64 bit version of MS-Office is installed, not the MS-Office 32 bit version packaged with eDiscovery GA i(10.x) installers. The above errors are the result of eDiscovery being unable to call the 32 bit components required to open and calculate the new checksums.
Install the 32 bit version of MS-Office using the following command line silent installer:
D:\CW\Installer\Distributions\v10.2\packages\Microsoft\Office2019PlusVLK\setup.exe /configure "D:\CW\Installer\Distributions\v10.2\packages\Microsoft\Office2019PlusVLK\config_cw.xml"