Postbox, an email client based on Mozilla Thunderbird for Windows and OS X. Here at Bath Spa we have gone over entirely as an institution to Google mail and all the other apps that come with it, which I think is terrific but I've always found the email interface rather unfriendly and, frankly, rather ugly and old-fashioned. Postbox looks great and is easy to use. It works well with GMail and Google Calendar, it has a button to send message content to Evernote and, in the Mac version, you can send attachments to Dropbox. I discovered it through the Prof Hacker blog of the US Chronicle of Higher Education. In the Mac version you can try it free for 30 days but at the moment it costs only $9.95.