columbusgeek - 5:38 pm on Apr 16, 2010 (gmt 0)
I've switched back and forth between Ent and Mail a lot over the years. I am back on Mail again after having some weird issue with Ent.
Mail does all the things you can do in Ent, and if it doesn't, there are always plug-ins for it at Hawkwings. Mail.app search is amazing. I use it constantly.
Add the 3 column view plugin for it, and call it a day.