One of my email addresses I access through Microsoft Exchange. The domain at which this is hosted did not have a ICO for the page which has been an annoyance for me since I list all my frequently visited pages on my Firefox Bookmark Toolbar. I thought I better take some action to resolve this so I searched for exhange ICO’s but had no success. So, I decided to just adapt the logos for exchange and also the Office Outlook 2003 icon and send them to the web admin. In case anyone else finds these useful I’m attaching them below. Note that all logos are property of Microsoft. I’ve created these only to make the experience for those running exchange better.
Previews of each included in compressed folder: 
or for terminal Linux users:
wget http://maddhat.com/wp-content/uploads/2010/05/exchange-icos.tar
Note: To create these I used Photoshop and the ICO plugin to export them properly. Found this site for creating them free online as well.