Hi Garabed,
As Jerry mentioned, this is not possible today, and will not come in the CRM 2013 release scheduled for October. There will be a new Server-to-Server sync option available that will provide Exchange Server to CRM Server sync for emails, appointments, tasks and contacts.
What's not available is a Track in CRM button in OWA, but using the server-to-server sync you can get OWA emails, calendars, tasks, etc. to sync with CRM.
Not sure how flexible the rules will be, if any, in the first release, so it may be a track all or track nothing option.