I am fortunate in that I have access to Outlook 2011. This is obviously an expensive piece of software if purchased specifically.
I have been forced to switch because of a number of problems I've encountered with Mail for Maverick whilst connecting to an Exchange Server. These are problems that I've never previously had (Moutain Lion, Lion, Snow Leopard or Leopard).
I've been using Outlook 2011 for a few days now. Whilst it works, I would switch back to Mail in a heartbeat, if its problems were resolved. Despite being free, compared to the horrendous price of Outlook, I consider(ed) it a superior product.
I hope that this provides some incentive for the Mail developers to address this problem before I get too comfortable with Outlook!