In order to re-configure your IPCop's interfaces, either the external (red) or internal (green), simply log on as root and run setup. From there you will see the menu that was presented during the original installation, and you will be able to choose Networking, then Address.

Don't forget to locate and change the DNS and/or your default gateway if those settings are changing as well.

When attempting to connect remotely to your ISA server using Microsoft's Remote Desktop, follow the instructions here.

If you need to "port" RDP through the ISA server, you'll have to turn off Terminal Services on ISA, and then use Server Publishing pointed to the other internal machine.

Here's a quick walkthrough on how to use the Exchange Mailbox Manager in Exchange 2000 or 2003.

SofTouch recommends at least configuring the "Deleted Items" folder for "Delete Immediately" with the standard settings of 30 days or 1024KB. This will allow the policy to run every weekend (either Friday or Saturday night) but only delete items that are older than 30 days, or larger than 1MB.