Deleting and disconnecting a client are two different things. 

A client you have invited, and who has established their own account may be disconnected from your account.  When you disconnect a client, you will no longer see their profile in your account, but they will maintain their individual account, simply with reduced access to features and functions, until they connect with a Pro again.  

Any client, however, may be deleted entirely from the system at any time.  When you delete a client, all of their data and history will be eliminated.

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