How to make Mulberry your default mailto URL handler?
Mulberry now /includes a capability to make it the default mailto handling application on either Mac OS X or Windows. Just answer OK if you receive a prompt when starting Mulberry. If its not already the default, and you do not receive a prompt on startup, go to the Attachment/Sending preferences panel and turn on 'Check for mailto URL Handling on Startup'. Then restart Mulberry and answer OK when prompted.