Helping people with computers... one answer at a time.
Unless you have two computers running simultaneously you cannot run two different versions of MSN Messenger at the same time.
Can I run two versions of MSN messenger at the same time?
In a nutshell: no.
MSN Messenger is designed to replace it's previous version when installed. The only real solution I'm aware of if you absolutely require it would be to have two computers, each with a different version.
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