Search the App store for Thread - You will find 2 Add ins
Click the Get it Now button on the Thread for Email Add-in.
Step 6 Who to Deploy To
A) Decide if you are going to do a test deployment or not (For these add-ins it is generally unnecessary)
B) Decide who you are going to deploy this to.
If you have a lot of users who will not use Thread we recommend creating a User Group for Thread Users and only deploying to that group
If the business is small and all users will use Thread then you can deploy to Entire Organisation.
For the Template Designer we do recommend you create a group and only deploy to that group as only certain staff should be allowed to code templates.
C) Once you have made your selections Click Next