How many users are you supporting? The "requesting data" error more often
than not indicates that the server can't keep up with the RPC requests that
are coming in. Also, more often than not, it is due to a lack of physical
memory. Check this link and go through the steps that will show you how to
figure out if the problem is with memory (or lack of), or something else,
such as disk subsystem, or network.
Also, FYI, but Exchange is designed to take up as much memory as is
available and is needed. If I open Task manager on my server, store.exe is
using 1gb of memory and inetinfo is likely using a chunk as well, though I
couldn't tell you the number off-hand. If another process on the system
requires memory, Exchange is supposed to give it back to the system, so that
it can be allocated to the other process.
Gardner & White
Exchange FAQ's: http://www.yqcomputer.com/
Exchange 2000 FAQ's: http://www.yqcomputer.com/