If you are a starting a solo practice and need email, I would highly recommend Gmail. Even though I am Mac guy, I freely admit that Gmail is better than MobileMe for attorneys.
One of my favorite things about Gmail is that they are constantly adding new features. Here are a couple of oldies but goodies.
Make repetitive emails easy with canned responses
Adding your signature to your emails is important, but adding your signature to every email in a chain of emails is annoying. Instead of using the signature function, you can make a canned response with your contact information.
That way, you will remember to manually add to your first email. On subsequent emails, you can leave it out, but it will still be listed in the chain.
Undo send saves lives
I already mentioned this feature in a previous post, but it is important enough to mention again. Undo send allows you a brief period (choose from 5-30 seconds) to stop an email from going out.
If you tend to type and send angry responses to opposing counsel, this could be a lifesaver. If you tend to forget words, like me, this gives you a chance to reread your email and fix it.
Drag and drop attachments
It is easy to attach the wrong file when you are choosing from a long list of file names. Admit it—you have probably sent the wrong file at least once.
With drag and drop, the chances of sending the wrong file are significantly lower. This is not supported by any study, but my own observations over the last few months.
For even more great features, check out this recent article.