I need to write a script for MS Exchange Server 2003 that will analyze incoming emails and put some of them into a specific mailbox. Of course it's a lot of information about Exchange Server scripting at MSDN, but amount of information there is very huge. Is it some simple tutorials available that will describe how to install a simple script on MS Exchange Server that will analyze incoming emails?
I believe the only way to accomplish what you want in exchange 2003 is to write an smtp event sink. Here is an overview. http://www.codeproject.com/KB/cs/csmanagedeventsinkshooks.aspx
Unfortunately, event sinks can be prone to have very poor performance characteristics and are generally discouraged. However, I believe that is the way to accomplish what you want to do.
If you decide to go down this path, here are a couple of references for you: http://support.microsoft.com/kb/894286 and http://msdn.microsoft.com/en-us/library/ms998610.aspx