I'm new to the list as I only stumbled across Roundcube the other day, and can't find any mailing list archives (are there any?); so forgive me if I repeat any feedback/questions. First off - awesome webmail client. Been waiting for a good open source Ajax webmail, and was certainly not disappointed. Found Zimbra at around the same time, and definitely very cool. but obviously on the heavy side.

This latest version seems to address some of the previous version issues that I spotted, however there's a few things I'll note here which are wishlists/feedback:

Great to see in the new version, but the current presentation isn't as ideal when you have lots of folders. I think would be boosted substantially by having sub-folders initially hidden and expandable, although possibly saving the "expanded" view in a cookie or prefs or something. It also truncates the name of long (or deeply nested folders).

I watched about 5 people initially try to use Roundcube for the first time, and everyone seemed to initially struggle with working out the navigation options. Ajax is new to most, so not everyone's used to the way things can work yet. Some suggestions:

- Make the cursor change to an hourglass when you double-click on a message, or put a progress bar/icon somewhere - so that people know something should be happening. It wasn't very obvious to double-click (based on the way the cursor/selection stuff happened) - so maybe make the clicking title automatically open the message, or provide a location on the line where a single click will definitely work.

- Two nav bars: The nav at the top and bottom is a bit confusing to users, so I'd suggest putting them all in the one location. Feedback from my initial test users is that some of the icons aren't obvious as to what they do (the inbox at the bottom, "logout" -- could be confused with delete -- so maybe make delete a trash can? This is obviously changeable through the skins, but feedback provided in case you think it's worthy updating the default skin.

- Use of alt-tags, window.status messages, etc: For a first-time user there's no real clue as to what buttons do except their icon. The mouseover URL doesn't provide much insight, as it's all JavaScript references, etc.

- Drag-and-drop targets: I noticed Zimbra changed the dragged item to green when over a valid drop-target. A helpful UI clue to assist users if easy to implement.

- Speed with large mailboxes: The first time I logged in (with 380 messages, but about 40 subscribed folders) took an age. I realise the cache needs to be built up, but this first-time hit (our imap server is currently quite slow, which may be contributing to it) is quite unbearable for users. Perhaps a message could be displayed like "Updating message listing" so that it moves off the initial login screen more quickly? Ditto for loading up an un-cached mailbox, although the "loading" at the top helps.

- Mysql max_allowed_packet: Encountered a user (with about 3000 messages in inbox) exceeding the default max_allowed_packet of 1M. Worked by boosting it, but there may be some issues with really large mailboxes under the single-cache-entry for per mailbox. Certainly a read-me note would help for this. When it did encounter the issue, the error was plastered behind the message list; although I think the changelogs indicates a possible fix in the latest version for this.

- Livegrid: You've probably already seen it, but check out http://openrico.org/rico/livegrid.page. This concept would be great for dealing with large imap mailboxes. Removes the need for pagination, and may be possible to reduce loading time by caching on-demand.

I seem to be having issues with Windows XP service pack 2 (and IE 6) with attachments. The new window loads but then says files are being blocked from downloaded (PDF doc). when I accept the download file it then asks me to save it rather than view it inline. I think this is something to do with the iframe, and may not be affecting other users (could be a mime setting on my webserver I guess). If sticking with the embedded attachment approach, I'd put some instructions to trust the website or something (but then again, not necessarily a good idea for webmail where any sort of attachment could be presented).

- Bug? When viewing a message and clicking "Delete" up the top the current build displays progress then reverts back to message listing and doesn't appear t delete the message. When you highlight the message in the listing and do delete, it does quickly disappear though.

Well that's it for my first post. Thanks for the great work so far. Shaping up to be a kick-arse webmail client. Let me know if you like the feedback, and I'll continue to assist with more usability comments.