To improve security, you can clear passwords and user accounts from the sign-in window. Clearing passwords and user accounts is especially important if you sign in from a public computer, or if multiple people use the same computer.
When you clear user accounts, user IDs, passwords, and display names are deleted. Contacts are not deleted from accounts.
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Close any conversation windows.
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If you are already signed into Lync, on the Status menu, click Sign Out.
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On the Email address pop-up menu, click Clear all saved accounts.
Important: When you clear user accounts, saved conversations are not deleted from the Conversation History. To delete conversations from the Conversation History, sign in to your account, click on a contact, and then on the Contact menu, click View Past Conversations. Select the conversations that you want to delete, and then click Delete
