Affirmative, and our support moved from "beta" status to General Release on December 1, 2009.

We have many clients using the
BES with Zimbra successfully daily, and Blackberry BES sync is fully supported.
01.com:
- Is the first Premier Zimbra Partner to also become a RIM Blackberry Alliance Partner
- Delivers multiple BES servers in the U.S. for Zimbra shared hosting customers
- Has already integrated BES into its Zimbra cloud/shared hosting automated billing system
Once signed up for service, read
Getting Started with the Blackberry if you'd like even more details.
What does native Blackberry sync mean?Native Blackberry sync means you don't have to install any software, and you can forget about having to perform desktop sync anymore (yes, stow that cable). Sync is over-the-air, with "push" mail, including the sent mail folder, what you read shows as read in your Zimbra account, etc.. And it also includes calendar, contacts, and tasks sync. Changes are reflected within seconds, and our experience is that with Native Blackberry sync, our new mail often appears on the Blackberry before it appears in our mail clients.
Note that straight
POP/
IMAP access on
Blackberry devices through your cell phone provider is free of extra
charge from 01.com. This service delivers more than just POP/IMAP mail. Once again, native Blackberry sync means you do not require any additional software to get over-the-air, automatic "push" mail, calendar, contacts and tasks sync to your Zimbra mailbox.
What are the requirements for over-the-air sync of Blackberry devices?Native sync for the Blackberry requires the Blackberry Enterprise
Server (BES), and 01.com maintains such servers for you for this purpose, for
use in the 01.com Zimbra cloud. BES connectivity, more than that for
iPhones or other mobile devices, demands an extra layer of
licensing and services, for which extra fees apply. You must have
access to the BES network through your cell phone provider (though you
don't need the BES service itself... you're getting that from 01.com!)
and it's assumed you have an unlimited data plan. Here's an overview of how data travels from your phone to your Zimbra mailbox:
Blackberry -> Telephone Company -> BES Network (RIM) -> BES Server -> 01.com Zimbra Server
How do I get into the 01.com BES Blackberry sync program?To get into the program, you must
sign-up for service and then request activation at our
online help desk for consideration, and instructions.
How much extra does your native, over-the-air, automatic, Blackberry device sync service cost?For Cloud Hosting accounts, with which you use your own
domain name, BES connectivity may also be purchased. Cloud Hosting accounts come with at least the first 30 days free, month-to-month or prepaid annual terms, and no cancellation fees. BES connectivity for each mailbox with an annual term is normally $99.99/year*, and no activation fee. BES for a mailbox with a month-to-month term is $9.99/month extra, and a $0 activation fee.
* There is currently a BES/Blackberry sync promotion, for a limited time, annual service for Blackberry is only $59.99/year/device.
Backberry BES requires Zimbra Mobile Service; included in the BES prices above.