Comments:"Chat history - Talk Help"
URL:https://support.google.com/talk/answer/161925
Chat history only works for users with a Gmail username.
The messages of your Gmail, iGoogle, Google Talk, and downloaded client chats are stored in your Gmail account so you can easily search for them later. You can even respond to these chats like you would to regular Gmail messages.
To access your chat history, click the Chats label in your Gmail account. A list of chats will appear, similar to the way conversations are listed in your inbox. You can label, star, and trash chats just like Gmail messages.
When you search in Gmail, matching chat conversations will show up along with matching email conversations. All chats are labeled Chats and are marked with the chat icon () so you can easily distinguish them from emails.
Chat history can be turned off on an individual basis by clicking More at the top of a chat window, and selecting Go off the record. Learn more about going off the record.
We've made a change to the Google Chat and Google Talk chat history settings. You can turn individual chats off the record, but you'll no longer have the option to make chatting off the record the default setting for all of your chats.