aMSN Messenger is an open source alternative to Windows Live Messenger with some additional features. It supports multi languages (currently around 40 languages) and allows you to transfer files with your contacts. aMSN has conferencing and webcam support.
The latest version of aMSN, 0.98.4 is out with several bug fixes. With this version you will be able to read offline messages. Download and install this aMSN latest version from the following links.
For Ubuntu Maverick 10:10
For Ubuntu 4.10 Lucid