Hi. I just got a Blackberry 7105t. Running on T-mobile service

So far I haven't fooled around with it much yet and this is the first time I will use a cellphone with web browsing capabilites. So everything is prettymuch stock and out-of-the-box as far as my settings go.

Here's my question, I'm already able to browse through most webpages. However the most important url I have to get to is my corporate page. The problem is that when I head over to browse there, the page informs me that I am running an older version of Internet Explorer and that I need to upgrade to atleast v5.5 to access the content of the web page.

How do I install IE 5.5 or up into my blackberry?

I've ran this question via google and have come up with zip so far. Hope someone out there can enlighten me.