I realized today, as I have five different email addresses in five+ different email tabs (1 personal, 1 company, 1 for spam, 1 for a company I advise, etc.), that it may be time to adopt a more consolidated view.
I have tried Mail, and in fact I keep my accounts integrated there just in case. But I've never been a big Mail fan. Gmail support (i.e. archive, labels, etc.) was an afterthought for Mail, making it not the best mail client for Gmail.
I have tried Sparrow. Sparrow wasn't bad, but ultimately I switched back to the web version.
I am excited for Mailbox for iOS, but they don't have a desktop version. And I haven't used it enough to even say whether or not it's a solution.
I know a lot of you deal with hundreds of emails a day from multiple accounts. What have you found to be the best mail client?