Read an article on Wall Street---where it says the boss dosent need to know if you are chatting! (I know the latest yahoo mail provides 'web messenger' too; but it takes a long time to load the emails, so I've switched back to classic)
The two websites listed where you can log into any messenger through the website. Unfortunately, you cant video IM. But, text enough to (bring a smile on your face)in the office to keep in touch with friends and family who are 1000's of miles away!