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We also encourage you to explore all things Zimbra with our team and members of the community.
For free on the BB side, you can use the desktop app to sync with Outlook (but that's more expensive on ZCS side and it's not OTA at all).
The cheapest if you want to keep the BB is AstraSync.
The overall cheapest is to trash the BB and replace them by ActiveSync compliant phones.
Even when buying them outside of "renewal plans" or "new line", it's cheaper (over a couple of years).
Depending upon the model of BB you have, you can use the Zimbra J2ME client. It doesn't provide "sync" to the native apps on the BB, but you can access your data from the device.
Thank you for all the suggestions. We are going to snatch the blackberry and throw it out the window when the users are not looking. Then replace them with Nokia E63 and mail for exchange.