I'm looking for an Instant Messaging library that at minimum supports YM, MSN protocol - preferably free but if it's worth to pay, why not.
First of all, have you had a look at libpurple-sharp which are .NET bindings for libpurple. Even if the project hasn't released a package, there is a lot of code there already and perhaps it is enough for your application.
I think that the only way that you will achieve support for as many protocols as libpurple is to either use libpurple or port it to .NET.
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