I've been reading this forum for a long time... but this is my first post
If anyone is still wondering how he can get both MSN messenger version 4.7 AND 5.0 on his computer: if you've already got 5.0 installed, put it in your trash folder... then install version 4.7 again, once you've put version 5.0 back you'll have both
Well, worked for me anyways(windows ME)