Exchange 2010 - Send a "mail waiting notifier"

Running 2008 r2 with Exchange 2010 sp2
Our board of directors is comprised of both internal and external users.
We created a distribution list to include all members which works no problem.
Now management is asking that when we send our board materials, the external users would only get a notification email that lets them know a new email is waiting for them on our internal server. So we created internal user accounts with mailboxes for them. So we need to figure out a way to get the "email notifier" set up. Even something 3rd party if necessary.
Basically the notifier would contain a link to our webmail and the board member will follow that link and login with their user account info we have created.
Ideas?
jcianciaAsked:
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James HIT DirectorCommented:
This is the only software I am aware of that should work for you.
You will need to test this.

http://www.owatray.com/
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