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Devteam 3Devteam 3 

how to get all users chatter messages

Rahul KumarRahul Kumar (Salesforce Developers) 
Hi Devteam,

Chatter Conversation can be retrieved via Data Loader.

A.) Enable the “Manage Chatter Messages” and “API Enabled” on a profile.

Special Consideration: We cannot edit the permission on the Standard Profiles. First we need to clone the profile and edit the permission.

B.) Open Data Loader.
1. Click Export.
2. Login to Data Loader.
3. Click Show all Salesforce Objects.
4. Click Chatter Message.
5. Choose the location for extracted .CSV file.
6. Click Next.
7. Choose all the Query Fields.
8. Click Finish.

You will now have the .csv file that consists of the History of Chatter Messages between users.

Please refer the below link for reference. I hope it will be helpful.

Best Regards
Rahul Kumar