Dear Mike,
I just downloaded the version 2.0.1 from Zimbra Web Site and problems to receive yahoo mail with version 1.0.4 and above with special characters in subject still happens. A single message with a single dot ".", zimbra is not able to download (use for example this.is.a.test in subject).
Can you please test it, by using the zimbra desktop on Download page?. Please use this, because if you use a newer version not available to download we will still have problems.
Thanks for your kindly help and patience.
Simon |