This past Sunday evening I deployed Zimbra Open Source 4.0 to our 15 person office and so far it's been going very well. I'm actually pleasantly surprised as to how painless it's been so far. Kudos!
Now, one of my users was very upset that her webmail client is not checking spelling on the fly as she types. I told her this was probably not going to happen, and she should just click the "Check Spelling" button before she sends an email. It got me thinking though, is there any way to set it to automatically check spelling on an outgoing message and prompt if there's any mispellings before sending off the email?