Subdomain for users

Hello people!
I'm using IIS 7.0 on Windows Server 2008 R2 as SO. I have a website that foreach user has a profile page. The link foreach user is https://domain.com/profile?user=%username%.

Now I saw that I must add a wildcard subdomain *.domain.com, but in IIS 7.0 I can't add this. There is another way to do that if I go to username.domain.com I see the profile page of this user?

Maybe you can give me some suggestion!

Thank you