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Ken Koellner @ EngagewareKen Koellner @ Engageware 

What causes Event Owner to Change on Lead Conversion?

I'm trying to analysize a scenario where there are Events for a Lead; Lead is WhoId on Event.  Then the Lead is converted to a Contact and The Ownerid (Assigned To) on the Event is changed to a different User.  I've tried to reproduce that scenario several different ways but the User assigned to the Event stays the same.

Does anyone know how to configure things so that when a Lead is convented, Events belonging to the Lead are assigned a different Owner?

DishantDishant (Salesforce Developers) 

Hi Ken,

This is possible with Flow. Below are few links which can help you with this issue. 

Update Related Record Using Salesforce Flow - A Complete Guide (https://www.forcetalks.com/blog/update-related-record-using-salesforce-flow-a-complete-guide/)
Activity history on a Lead when it is converted (https://help.salesforce.com/s/articleView?id=000385227&type=1)

The below question is not the exact same question but is something that might help you (Especially the Apex trigger which is mentioned in the answer.)

https://developer.salesforce.com/forums/?id=906F0000000AxW5IAK

Please mark this as a best answer if these articles helped you! 

Thank you!