You seem to also forget mutt, which, while substantially less useful, quite clearly does not suck.
You seem to also forget mutt, which, while substantially less useful, quite clearly does not suck.
I'm saddened by Mozilla's decision, because though I like mutt, I unfortunately live in the current decade and work with humans who are prone to sending HTML email, and Thunderbird has been the best Linux option for a while. I hope the KMail or Sylpheed people gain some development effort, because either one could be really good if it just had a few more developers.
More precisely, you work with humans who are unwilling or unable to configure their webmail accounts not to send HTML email because the webmail service providers make it hard to configure the accounts that way because that configuration reduces their ability to sell advertisements.
The 9000 ways of searching things in Thunderbird are not always an advantage, I found it makes it really hard for me to find things, because I have to select so many things. The searching of Mail.app makes me get what I want within 2 seconds for 95% of the cases. If it doesn't there's usually a sensible drop-down suggestion of where to search (body, subject, recipient, sender). And if that does not help you, you can always use the system-wide Spotlight to drill down even further.
I've moved from Thunderbird to Mail.app about a year ago, and have been pleasantly surprised. I'm a pretty heavy mailer, receiving hundreds of mails a day and sending out 30-50. I also search my archives regularly and that has not been a problem.
I've not tried filtering into folders, but your mailserver should do that for you anyway.
We either need more extensions to IMAP (but what clients would support them?) or we need better web apps.
Edit: might be windows only, though.
So from my perspective, Mail.app isn't "way behind" Thunderbird. Rather, they're at parity, and Thunderbird has a lot of other stuff that I can't use.
http://email.about.com/od/macosxmailtips/qt/How-To-Use-Mac-O...