I've been trying to connect a Zimbra client to Alfresco 3.2r2 with no luck. It works with Thunderbird just fine.
The testing phase works fine but when the Zimbra client does a SELECT on the Alfresco INBOX folder, it gets a huge UIDVALIDITY response value of 1266958011581. This is on the order of 41 bits worth of value (126FC950CBD hex).
The Zimbra folks have taking this as a bug on their part, but I'm posting to see if there could be fix to Alfresco which would put this value in a more reasonable range.
CentOS 5.4
Alfresco 3.2r2 Community
Zimbra Web Client 6.0