Mozilla Thunderbird comes by default with its IMAP concurrent connection limit set to 5. This breaks Zimbra (as well as Courier-IMAP, and probably other IMAP servers) unless this is throttled back on the client or increased on the server. However, we're a service provider. We'd like to offer Zimbra to our customers without requiring them to dig around in preferences files for popular applications to make changes allowing the service they're paying for to work. Is there a preference anywhere I can set to change the concurrent connection limit?