I have been using Zimbra FOSS for several years and always found it to be a nice looking interface. Testing 8.0.1 and this very drab, plain, grey color is very disappointing. The themes do not really address this as they typically just recolor some of the borders and headings. The actual icons down the side of the windows are still drab grey. I think this style of minimalist look will put people off this product, there is a fine line between gaudy and dreary, which Zimbra trod very well in the past. Now it is just corporate bland and very unappealing.