Be sure to vote for:
RFE 6045 - allow attachment of contacts to messages
Until
RFE 20742 - export vcard vcf of contact from web client is finished some alternatives if your curious how / they are semi-technical (not as user friendly - someone should make this a Zimlet):
Move it to its own address book, then in another browser window to go: server.domain.com/home/~/addressbook.vcf
Or if you want to download a bunch: server.domain.com/home/~/addressbook.zip
Alternatively if you know the contact's id # (found in SOAP responses by using whatever tool like firebug or appending ?dev=1):
server/home/user@domain.com?id=448
(other search queries/item types etc)
Then send it as an attachment to an email...
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You can construct the url in a variety of ways ie:
/user/~
/home/accountname
/zimbra/user/~/
/zimbra/home/~/
/zimbra/user/accountnamehere/
/zimbra/home/accountnameehere/
/service/home/~
-'user' & 'home', as well as 'service' & 'zimbra' are mostly interchangeable/often not needed
-You can also replace accountnames with ~ for simplicity.