We tried this with Internet Explorer 7 and 6 on Windows Server 2003 and Windows Server 2000
Open up Windows Task Manager
Start Up Internet Explorer, take note of the Memory Usage
With Task Manager still open and your eye on Internet Explorer start surfing around to other sites, such as ESPN, MySpace..etc. And watch the Memory Usage of Internet Explorer. Memory Usage keeps going up..and up..and up.
Now still with Task Manager open and keeping an eye on the memory usage, minimize Internet Explorer. Memory Usage goes down.
Now maximize Internet Explorer. Memory Usage goes up to what it needs.
We did the same in Excel 2003, Outlook..etc.
We also tried this on the Mac using Safari with different results. Opened up Safari and surfed around the Memory Usage kept climbing. Minimized, and the memory didn’t go down. We hid Safari, still did not go down.