Well, that might be overstating it.
There are a number of reasons why you might have to change your domain name: copyright suit, company merger or buyout, or a business name change.
Whatever the reason, when you change your domain name (your url) you often give up all the trust you’ve built up at the search engines, crushing your search engine rankings and greatly diminishing the traffic SE’s provide, at least in the short run.
This article, Switching to a New Domain Without Losing Your Google Rankings, explains why a "temporarily moved" 302 redirect may be more search engine friendly than a "permanently moved" 301 redirect.
The logic is sound, although I haven’t had a chance to try it out personally yet.
Hopefully you’ll never be forced to change your company URL, but if you do, I’d follow the directions here.


