I am new to the Progress language. In fact, I've been asked to do some preliminary research on the language even though I have no experience. We are purchasing a product written in Progress version 8.3 (I believe). They are on schedule to upgrade to version 9.1B by the end of this year. Are there any issues if we have the client and the server running on different version of Progess software? And if so, what do I need to be aware of? Thanks.