I have tried utilising this with Outlook Web Access 2010 (Version: 14.1.270.1).
The link.txt file can be amended successfully to read (for example) https://owa.mydomain.com/owa/?ae=Item&a=New&t=I...
Id #6320 | Release:
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| Updated: Feb 14 at 8:41 PM by RogerGreenhalgh | Created: Mar 13, 2011 at 3:58 PM by RogerGreenhalgh
Using these example mailto links with Hotmail I have found the following:
mailto:anyone@at.all?subject=#$&|~`!@%^*()_-+={[}]:;.?/'"\
~`!@%^*()_-={[}]:;.?/'\ are characters which are handled.
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Id #5644 | Release:
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| Updated: Feb 14 at 8:41 PM by crenshaw | Created: Oct 4, 2010 at 3:30 PM by crenshaw