CWmike writes "Microsoft co-founder Paul Allen has called Windows 8 'puzzling' and 'confusing initially,' but assured users that they would eventually learn to like the new OS. Allen, who co-founded Microsoft with Bill Gates in 1975, left the company in 1983 after being diagnosed with Hodgkin's disease. In a post to his personal blog on Tuesday, Allen said he has been running Windows 8 Release Preview — the public sneak peak Microsoft shipped May 31 — on both a traditional desktop as well as on a Samsung 700T tablet, designed for Windows 7. 'I did encounter some puzzling aspects of Windows 8,' Allen wrote, and said the dual, and dueling user interfaces (UIs), were confusing. 'The bimodal user experience can introduce confusion, especially when two versions of the same application — such as Internet Explorer — can be opened and run simultaneously,' Allen said."