To start an instant message (IM) conversation with a person or groups in your Contacts list, do the following steps:
To invite additional people to an IM conversation:
By default, Lync automatically saves your IM conversation history. To view or continue previous IM conversations:
Lync displays your conversation history.
2. Double-click the conversation that you want to continue.
To delete or remove items from your IM conversation history:
To disable the automatic saving of your IM conversation history: