Safari cannot access, ONLY Micosoft Internet Explorer works...why?

I want to access a new site called: Employee Self Service. Here are the instructions:

1. Employees who currently access ZISD enterprise applications from home using VPN (Juniper) such as Chancery and Lawson may also use ESS from home.

2. Internet Explorer is the only browser that can be used. Safari and Mozilla are not supported browsers for ESS.

3. Two Microsoft patches may need to be installed. If you experience problems, the bottom of this message will contain explanations of possible problems and links to the appropriate patches.

a. Internet Explorer Patch 1
b. Internet Explorer Patch 2

So..is that that, or is there a way to access the asinine web site that can only be accessed through Internet Explorer?

Thanks,

Teacher