Awww, well that's different.
Send & receive message size limit is what it's all about.
"The first user who is able to use the complete space will receive from us a free email account with one TByte space on a dedicated server" ?? So 200 messages with 500 MB attachments gets you an account?
But hm... you could upload 500MB worth of personal crap at a time though and have it accessable from anywhere.
So just to set things straight, you're saying it's free 10 GB with 500MB send & receive message size limit? $5 is only if you wish to get the full hundred GB?