Open Mail Client on client machine

Hello,

 I need to open the default mail client on a client machine once he hits a button (or link) on UI. The mail client must be populated with default info (from, to, bcc, cc, sub, body, priority). I understand that two approaches are

1. Using Mailto: (but with limitations like Cant use a FROM field, Cant set Priority, Mail Size limitation) - Hence cant use this

2. Using MAPI (but the code I have opens outlook on server rather than client machine)

 Can someone help with MAPI code that opens outlook on client machine? Or is there any other way to achieve this?

Thanks

Pranay. 
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