here we go! -- Doesn't (officially) support HTML signatures. -- Requires a lengthy reindex on any internal database change, which can happen multiple times a year. -- Severe, egregious issues with corrupted or blanked out Keychain entries -- Easily works itself into a lather where it cannot properly authenticate with anything until the entire system is restarted -- GMail IMAP sync-thrashing and message corruption that can render some accounts unusable -- Crashes on queueing massive message previews -- Customers almost uniformly loathe the recent UI changes -- The new search UI is nearly unusable for most, requires frequent spotlight rebuilds -- Drafts-on-server duping -- Plugin hassles and failures, especially as regards Archive Utility and PDF handling -- Evaporating local folders -- New rules about Archiving that don't play nicely with grandfathered Archives -- Auto-setup of new accounts that gets hung so badly you have to back in a patently entry just to get the chance to hand-edit settings

It is unreliable and unfit for heavy duty use. I've lost a third of my customers to Outlook.