It is sad that the cost of email software and servers (which the sending and receipt of is in and of itself FREE) should be not at a high priority for some companies. My clients agree to pay a fair amount for server maintenance, software, security and connectivity, or they need to get a different consultant.
If you're a small business owner and really can't afford it, that's a different story. My opinion there is that perhaps you should simply get a gmail account for your business OR use free, personal gmail.