You folk might like deep purple (not the band) but the theme is difficult to distinguish between one proton app and another . -- especially on mobile devices. I know people are touchy about this subject, but you need a radical redesign of your UI. Its easy to mke mistakes using your app and the color changes would help a lot.. I truly wish you would spend the money and hire a real UI designer maybe someone from the old Jobs apple era and have them redo mail and please calendar .. which I have totally given up using .. (use the Apple calendar app as a guideline) --