Change URLs to lowercase?

[Mattwhf]

On a my vBulletin, I am getting this url structure when in its thread title, it contained with uppercase.

For example:

Title: What Hosting Package is Needed for a Site with Thousands Active Users Everyday?

URL: www.example.com/threads/16442-What-Hosting-Package-is-Needed-for-a-Site-with-Thousands-Active-Users-Everyday

I want to have URL like this:

URL: www.example.com/threads/16442-what-hosting-package-is-needed-for-a-site-with-thousands-active-users-everyday

Mean that I want all words in the URL should be lowercase.
while the title is not preserved.

It is possible to do this?

Thanks
Matt