How do I delete my chat history in Skype for Mac OS X?

Deleting all chat history

It’s easy to delete your chat history:

1	Sign in to Skype.
2	In the menu bar, click Skype > Preferences….
3	In the window that opens, select the Privacy panel.
4	Click Delete All Chat history. This may take a few minutes to delete.

You can also indicate how long you'd like to save your history for. In the Save chat history area, select from: 1 Month, 3 Months, 1 Year, Forever, or Never.

It’s not possible to delete a part of the conversation history only, but you can delete a conversation with a particular Skype contact. This will delete all the conversations you’ve ever had with that contact.

Deleting my entire conversation

It’s easy to delete a conversation:
 

1	CTRL-click the conversation and select Delete Conversation....
2	In the pop-up window, click Delete.

Removing/clearing all recent conversations from the sidebar

You can also remove all recent conversations from the sidebar:

1	In the main menu, go to Conversations > Clear Recent….
2	A message box appears asking “Clear all recent conversations?”.
3	Click Clear Recent. Your recent conversations are removed from the sidebar.