We just added some functionality at the request of a site.
The subject is reading the contacts in the "Suggested Contacts" folder in Zimbra and migrating those to Exchange.
Now it's possible.
The newest zCalReader looks for files named:
and loads them both into “Contacts” in Exchange.
Why cannot we load econtacts.vcf into the Outlook/Exchange "Suggested Contacts" folder? Because Exchange Web Services does not currently give us access to that folder.
We actually found in a migration this weekend a 24 Mb exported Suggested Contacts list containing over three hundred thousand contacts. That caused zCalReader to bomb (we just weren't scoped for that many contacts).