Here's how to copy your complete Message Archive:

1. Close Yahoo! Messenger (if it's currently running).
2. Go to your Desktop and double-click "My Computer."
3. Select the C: drive.
4. Go to "C:\Program Files\Yahoo!\Messenger\Profiles".
5. Your "Profiles" folder contains your complete Message Archive. Copy it to the same location on another machine if you want to view it elsewhere.

Please note: If you copy this folder to another machine, your complete Message Archive will be copied, overriding the Message Archive on the machine to which you're copying.