I'm sorry if you already know. Anyhow, when you installed Plus! and you go to the special page from MsgPlus.net (http://www.msgplus.net/global.php?setuppage=y&up=y&lang=ne in my case), then there is a little bug in the language:
Messenger Plus! is succesvol geüpdatet!
Of course, this has to be:
Messenger Plus! is succesvol geüpdate!
After all,
geüpdate isn't a valid Dutch word, but I wouldn't know an other translation for it