We have an Outlook addin that fires when an eMail is sent or received. It matches the sender or recipient's eMail address with a column in an MS SQL Server database table and if it gets a match it updates another table in the database, updates the eMail Status and makes a copy of the eMail as [url removed, login to view] file.
Where the site is running MS Exchange it would be more efficient for an addin to Exchange to perform this function especially where Cached Exchnaged mode is on which bypasses the Outlook addins.
So we need an Exchange add in that processes the incoming and outgoing mail items, performs the updates and creates the .msg copy file, and whatever is needed to install it and manage it.
The source code for the existing Outlook addin which is written in VB.Net in Visual Studio 2010 and has all the database querying and updating code already in place is available to you.
Thanks for looking.