If you have installed the package pidgin-sipe, you can connect to networks using the Office Communicator protocol in Pidgin. However, there is a bug in the Linux Mint 13 version of pidgin-sipe that will give a "Read error" when you try to connect. To fix this, run the following command and reboot to activate:
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echo NSS_SSL_CBC_RANDOM_IV=0 | sudo tee -a /etc/environment