Thanks for your interest - I often get the assumption that our product syncs email...it actually doesn't, I'm going to try to make that clearer on the site.
However, our servers are IMAP-idle capable. If you use us as your email provider and add the account to BIS, any deleted/sent email will be synced (the limitations on this are the same across all IMAP BIS accounts). The IDLE portion of our service means emails are pushed to your BB instantly.
I hope that helps / if you have any questions, please send us an email.
Sync your Contacts/Calendar/Notes/Tasks wirelessly from your PC to BB - http://www.thinkpost.net