Maybe you found it already, but I found it this week. The Storage Requirements Calculator from the Exchange Team.
Possibly you had this issue also the last couple of weeks, NDR’s for messages you don’t have send yourself. Together with one of my collegues we did some further research on it. This type of SPAM is called a Backscatter, at this moment there is not really a solution for it. BUt what is a backscatter exactly:
A new feature in Exchange 2007 is Transport rules this rules can be added in two ways, via the Exchange Management Console or via the Exchange Management Shell.
Remote Server Administration Tools makes it possible to manage a Windows 2008 server from you workstation. This tool is the Windows 2003 Administration Tools, which was available for Windows 2003, for Windows 2008. This tool is only available for 32 and 6 bits Vista systems.
As you may now you can do many things with Powershell to get things done in Exchange. Somethings can only be done via Powershell.