Maybe someone was thinking of old Windows bugs:
( http://support.microsoft.com/kb/263558  last updated March 11, 2009 )

"In earlier versions of Internet Explorer (Internet Explorer 3.x), DNS host entries are cached for 24 hours by default. In many cases, this is too long. During this period, some host entries stop working because of change in the IP address of the remote server that was initially resolved.

Internet Explorer 4.x and later versions modify how DNS host entries are cached by decreasing the default time-out value to 30 minutes."

Applies to all versions of IE 4 thru 8.
-John

On Apr 24, 2009, at 12:28 PM, Jeffrey Utter wrote:

The service status postings for these changes are a bit miss-leading.  There should be NO need for anyone to do anything when our changes are made.  Before we make any changes to load balanced services with a high profile we set the TTL down for a few days leading up to that change.  Like Troy said.  This will mean that systems should not be caching that information very long, and would only have to flush their local DNS if they visit the site in the five minutes before the change, and again within 5 minutes. 
 
So in short, the service status will be changed to remove the statement of rebooting, as this should not be an issue, and even if it is, it won’t be for more that 5 minutes with or without a reboot.
 
--
Jeff Utter