Zimbra looks to have really promising potential with proper email synchronization (the only thing I miss from Notes) in a relatively sensible client. However, it seems to have one stumbling block that makes it unusable for me at the moment.

I hope I'm wrong here, but there doesn't seem to be any way of having multiple messages open at once. You can't even read one message while writing another, let alone write several messages at once.

I'm not too worried whether multiple messages (reading or writing) are shown in tabs [as in online yahoo mail client] or multiple windows [as in Thunderbird].

I hope someone can just tell me I am missing a feature that is there. I can't see any other posts on this issue, am I alone in wanting it?