Syncing Sent Items to Mobile

[tonkski]

I'm new round here.

I've noticed that when I sync my Nokia E51 with Zimbra using mail for Exchange, sent items from the server are not synced to the Nokia. This has been mentioned already here:

How to beat Blackberry-Features?

As a consequence of that thread a bug was raised:

Bug 36886 – Sync sent items with mobile device

The above bug is marked as resolved as a duplicate of this bug, which is marked as closed and "invalid":

Bug 15881 – Zimbra Email sent from phone not listed in SENT ITEMS folder

And the comments in that bug seem to suggest that I just need to switch on syncing for sent items. How do I do that please?