CRM has taken major steps forward with server synchronization and being able to synchronize already tracked activities, but there is still a major gap--emails not sent from Oultook cannot be easily tracked. This is a major gap and should be addressed to complete the server sync story. Synchronization is only good if emails can get in to CRM. If a user is only using CRM for tablets, there is no way for the user to track an email.

My suggestion would be:

1. have a user definable hashtag per record. When the user adds the hashtag to an email subject. track the email regarding the record connected to the hashtag.
2. Have a track folder in exchange where any emails dragged to that folder get tracked.
3. Allow users to BCC an email to a forward inbox and then track the message. Note--we can come close to this now; however, the router/forward mailbox does not monitor BCC lines, so it only works if the email address is in to: or cc: line.

Of all these options, only 1 addresses the "set regarding" functionality in gives users outside of outlook equivalent tracking for initial emails. As a short term solution, give crm for tablets/crm for phones users the ability to send tracked emails through the apps.