Our company switched to Cisco IP phones from an aspect phone system back when IE7 was just coming out. I don't know how much our company saved, but those who knew said it was a lot. The only limitation now is that the client software can only be installed on a system running IE6. Here is the
field notice stating the issue. That means that we are stuck with Windows XP unless our company pays Cisco about $300,000 to upgrade their software. There is no problem with upgrading to IE7 or IE8 after the fact, but the client software can only be installed or reinstalled with IE6. All of the web based applications that we use work fine with IE7 and IE8. Unless my company has to start using some software that won't work on Windows XP, they are not going to spend the money on the upgrade.