Two issues in this post:
1) I just moved to a HTC One X and immediately discovered that the Calendar won't sync. I've tried most common issues, up to and including deleting ALL events, but no go. I've had to resort to a 3rd party app to get my calendars working. Thread about the issue on XDA-Dev here.
2) While trying to fix the problem, I upgraded Zimbra to 7.2, and now plaintext emails come in with no line breaks, I just get a single stream of text. Is this related to the new S-MIME functionality? Is there a setting I can update on the server?
As of now, none of my Zimbra customers have complained, but it's only a matter of time...