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eyekameyeyekamey 

apex managed sharing for calls and meetings (activity and event)

Is it possible to use apex manged sharing for calls and meetings if we set the OWD for them to private? Does apex manged sharing support these objects? I know this works for custom objects and account/contacct/case.
AnudeepAnudeep (Salesforce Developers) 
The options for sharing access to Activities are described here

You can also see that Sharing Rules for Activities is an Idea that is not currently under consideration:

There is no Share object for Activities at this time, but you can make use of the "controlled by parent" option to control the permissions. You could also use a Visualforce page "without sharing" to allow access, depending on your situation and needs:

https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_classes_keywords_sharing.htm

If you find this information useful, please mark this as solved by selecing this answer as best so that it may help others in the future. Thank You!

Anudeep