Small font in Instant Messenger

I use the instant messenger extensively for quick communications. Noticing that the font is really too small to read quickly and would like to make it bigger as is done in Gtalk. Unless I have missed the control, I need to be able to specify what font size to use. A global adjustment would be fine.

The small fonts are giving me a headache.

Hello,
I am sorry, but it is not currently possible. I added it to our feature request list so you can expect it in one of the next updates.