Failed to add emails to PST. Failed to create instance of Redemption COM type

Problem

eDiscovery or FTK Central email collection shows a hit count, but then later goes to "Failed" status.

System Log shows the following error:

Failed to add emails to PST. Failed to create instance of Redemption COM type: 'AccessDataRedemption.RDOSession'. [1]

Resolution

eDiscovery

1. Confirm you've installed Outlook 2016 32-bit Professional Plus on the collections Work Manager machine.
2. Open a command prompt.
3. Change your current directory to the Work Manager installation folder (typically "[drive]:\Program Files\AccessData\eDiscovery\Work Manager")
4. Issue the following command:
   

   regsvr32 AccessDataRedemption.dll

5. Try your collection again.

FTK Central

1. Confirm you've installed Outlook 2016 32-bit Professional Plus on the FTK Central server.
2. Open a command prompt.
3. Change your current directory to the FTK Central installation folder (typically "[drive]:\Program Files\AccessData\Forensic Tools\<version>\bin")
4. Issue the following command:
   

   regsvr32 AccessDataRedemption.dll

5. Try your collection again.

Cause

PSTBuilder relies on a locally installed instance of Microsoft Outlook 32-bit. When AD eDiscovery tries to call PSTBuilder to build the collected emails into a PST file, it crashes because the Work Manager component cannot talk to the Outlook 32 bit DLLs required for PST generation.