Kumar Appaiah comments "If you are really bothered about resource-hungry Evolution, how can you prefer Thunderbird, which is, if anything, worse than Evolution when it comes to resources?". Well, that's not been my experience. Evolution starts other processes in the background (evolution-alarm and evolution-data-server) besides launching it's own copies of spamd if I turn on junk mail checking. Still, I decided to give it another try and configured three IMAP accounts and a usenet account (same as my thunderbird) and here's the resource usage
30984 rganesan 16 0 170m 79m 17m S 0.0 15.8 1:37.58 evolution 8428 rganesan 16 0 223m 51m 22m S 0.0 10.2 1:36.69 mozilla-thunderbird
Even though the VM size comes up smaller, combined with the other background processes, evolution's VM size comes up much higher. Besides, I guess it doesn't really make sense comparing the VM size, it's the RSS which really matters. Evolution also shows up other quirks when talking to Myrealbox IMAP server. Myrealbox's IMAP server doesn't appear to be fully standards compliant but still Evolution's quirks are very strange. Some folders appear twice and the Sent folder doesn't show up at all. The second quirk is especially annoying and strange because when I try to subscribe folders the missing folder shows up as already subscribed. On my other E-mail account on Fastmail, Evolution does not appear to take into account the folder prefix that I give (I tried both INBOX and INBOX.). Any way, despite these issues, I am actually beginning to like the look and feel of Evolution. It's a really polished UI, I'll probably play around with it some more.
I switched to using IMAP because I wanted an account accessible from multiple machines (I don't like carrying a laptop). But IMAP has the added advantage that I can easily switch between mail clients as I please :-). Kumar also comments that he prefers mutt any day. I like mutt too and I use mutt for all my pop accounts (including gmail). However, mutt's IMAP support is not good enough for me because, first it doesn't cache and second working with multiple folders is not easy.