If you're using Hotmail as the default mail handler, when you type the mailto:mymail@abc.com to compose message to an email address, the following screen appears with HTTP 404 error:

Server Error in '/' Application.

The resource cannot be found.

Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.

Requested Url: /secure/start

Workaround:

The address bar shows this entry:

http://www.hotmail.com/secure/start?action=compose&to=mymail@abc.com

Changing the above to the following line helps:

http://www.hotmail.msn.com/secure/start?action=compose&to=mymail@abc.com

To make this permanent, try these steps:

> Open Regedit and navigate to:

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Hotmail

> Create a new REG_SZ value named posturl

> Double-click posturl and set its value exactly as given below:

http://www.hotmail.msn.com/secure/start

The mailto: links should work fine now.