Java EE (Java Enterprise Edition) General Discussion

Hello,
I developed a microsoft outlook addin which added a custom message class to our outlook exchange. Now if a user sends a message of type "IPM.Note.OurCustomForm"; the recipient gets our custom addin when the message is received. My question is, is there any way to use JavaMail to send a message from our server, which is all in Java, which the Microsoft Office exchange will pick up as the "IPM.Note.OurCustomForm"; message class and display my addin.

Some example code, or reference to similar problems would be appreciated, I have not programmed in Java since I graduated many a years ago :). Also, I was hoping to do this without using third party software (unless it is free), but I would none the less appreciate information about them too.

Thanks much,