Is gmail blocked on your office network and you have an important mail to check? Here is a workaround that may work for you:
1) Go to iGoogle.com.
For those who do not know about iGoogle, it is a google's concept in which you can create a home page for yourself. This home page can contain any gadget available in google's gadget library. A gadget is basicaly a small application which you can place anywhere on your iGoogle Page. [More]