"Perform a Custom Action"

notme

New Member
Outlook version
Outlook 2019 64-bit
Email Account
POP3
I'm trying to create code to auto process incoming emails for a client. it has to parse certain incoming automated messages.

One solution path I'm pursuing is a VSTO addin. I'm doing that because the Rule with Run Script I created was causing a security prompt when it tried to access the email body text. I read that the security prompt can be avoided using a VSTO add-in.

I want to call the VSTO via Perform a Custom Action, but that rule option is not available in my version:
Microsoft® Outlook® 2021 MSO (Version 2202 Build 16.0.14931.20116) 64-bit.
The client will be running 365 Desktop: Microsoft 365 MSO (Version 2201 Build 16.0.14827.20180) 32-bit
(I do see the option on a machine with Outlook 2003)

I have applied the reg key
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Outlook\Security\EnableUnsafeClientMailRules = 1
which enabled Run Script, but the Perform Custom Action did not appear.

Can Perform Custom Action be enabled?
 
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