How can someone who joins an existing Microsoft Communicator chat see the history of what has gone before?

For example:

Larry: [describes problem]
Moe: [enhances problem]
Curly: We should ask Shemp

[Shemp joins]
Shemp: What's going on in this thread?

Is there any way for Shemp to see what Larry and Moe have already typed?

I have tried copy-pasting the whole thing, but that invokes an error with no error message - possibly "too much text."

Update:

Is this functionality what Microsoft calls Group Chat, and requires a separate product?