1. Can any jpeg files created with Microsoft OS software be opened in Adobe Photoshop for Mac?
2. What is Adobe Essentials software? How much does it cost? What's a good place for buying this software?
2. i dont know. :-)
To the second part of your question you could check local computer store's, here we have one called computer exchange that also sells 2nd hand software and can get some real deals on programs, from Canada but have heard a lot about E-Bay.