Another alternative is to move it to it's 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
Then send it as an attachment to an email.
You can construct 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
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