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We have zimbra 5.0.19 here and unfortunately I have no control over the server version. I've been told there is no plan to move to 6.0.x anytime soon so I stuck with a 5.0 server.
I'm wondering if I'm going to be out of luck if I upgrade to outlook 2010 (32 bit) on the client side? Which version (if any) of ZCO can I use in this case?
Outlook 2010 might work with a 5.0.x server, but we wouldn't support the configuration. If you've got a 5.0.19 server, then you should use 5.0.19 ZCO. I don't know if it would work or not, but I wouldn't recommend it.