When you send me an E-mail with an attachment you want me to look at, why do you want me to pay circa £300 for the privilege? If your software is defective and can't save in free, open file formats that everyone can read, replace it. It won't cost you anything. It will save my time - that you've already asked me to spend doing a favour for you - because I won't have to spend twenty minutes looking for websites that can have a stab at converting it for me. Useful as they are, I have no clue if the end result I look at has any resemblance to the way it looked from within your proprietary prison.
Yes, I'm talking to you.