URL in SERPS has changed

Since the last crawl there is a new homepage URL in the google SERPS.

[christoph26]

Dear Webmasterworld Community,
I am rather new in this business and I hope you can help me.

Let’s say I have a homepage called www.example.com with a page rank of 3. There are several internal links and one link called HOME which points to www.example/default.aspx?StrID=ST1-1-0 which is the actual home page.
Since yesterday the URL www.example.com disappeared in the SERPS and now there is only the other URL (www.example/default.aspx?StrID=ST1-1-0) and it’s page rank is zero!
What is my fault?

Thanks a lot,
Christoph

[edited by: Marcia at 9:32 pm (utc) on Jan. 23, 2004]
[edit reason] Examplified domain name. [/edit]

[Birdman]

Are you using a redirect to send requests for xyz.com to www.example/default.aspx?StrID=ST1-1-0?

If so, simply point your home links to example.com, rather than the ugly URL.

What's probably happening is, Google is confused because there are two different URLs serving the same page. They will usually only index one URL per page.

Oh, welcome to WebmasterWorld.com!

[edited by: Marcia at 9:33 pm (utc) on Jan. 23, 2004]

[christoph26]

Thank you.
Oh no - well our Internet Information Server is point on this dirty URL.
But I think you might be right that google is confused about the different link pointing on the homepage.