I appreciate your comment but was simply curious as to what people here are looking for beyond "Mail." I admit that I miss certain facets of Outlook (from a past job) and also from Lotus Notes email. I have to smile having been long long ago an administrator for a multi-state set up of an ancient email system - CC:Mail all ran on OS/2 plus my rather sleek REXX maintenance scripts/programming.
So, what do you like about your mail app over "Mail" in particular?
I own Postbox, Airmail, Outlook and Sparrow but I keep going back to Mail as it takes care of my simple needs (2 POP and 2 IMAP mail accounts). My only real complaint is that you have to double click a contact to add it into the "To" field when previously a single click will do.
I also dabbled with OS/2 (the predecessor to Warp, Warp and Ecommstation) and wish I could set it up in a Parallels VM just for nostalgia's sake