Tor browser bundle from Tor project website is just what it says it is - a browser bundle. Any application, other than the patched browser in the bundle, that connects to the internet is NOT
routed through the tor network.
If you want a system where all connections are routed through the tor network, you should use TAILS - https://tails.boum.org/
You can run it as live CD or create a persistent volume. Thunderbird and Pidgin are routed through the network and normal connections are blocked.
Hope that helps.