Does anyone have a reliable way of syncing contacts in a Smartermail account with contacts in a Gmail account?  The sync has to be bi-directional, ongoing, and automatic, i.e, not just a one-time import.

If you make a change a Gmail contact, it needs to sync to the Smartermail contact list, and vice versa.  Bi-directional.

We've tried several different mobile devices and apps (Outlook, eM Client) in the middle.  All apps will connect to both accounts and sync contacts WITH THE DEVICE, but will not PASS THRU those contacts from one mail account to the other.  

Need this:

[Gmail contacts]  <---> [[app or device]] <---> [Smartermail contacts]

We have over 1,000 users who need this ASAP.  Their company just subscribed to a new CRM whose API only works with Gmail, forcing all users to get a free Gmail account.  They need a way to sync those Gmail contacts with their official company Smartermail accounts.

Any and all ideas are welcome.