New user trying to work out how this all works... thought it was supposed to be easy!

I have got files and bookmarks off of my master computer and onto the laptop but the big reason I wanted a sync program is so I can have a copy of my mail on the laptop when I am working on site.  This will then be synced back to the main desktop computer when I am back in the office.

However I am unable to get the mail sharing setup.  When I click setup sync library the words 'No mail clients are available' appear next to the email heading and nothing that I can do elsewhere in Syncables seems to be able to rectify that.  I have tried shutting down the laptop and starting again, reinstalling Thunderbird and all manner of things.  Please help