- Metro Start Screen (default for mobile devices)
- Metro-Style Start Menu (default for All-in-One devices)
- Windows 7 Start Menu (default for desktops/laptops) with the option to dock Metro tiles to the top/right
Windows 10 Technical Preview - What's missing
This is one of the most-debated topics concerning Windows since 8 was released. Some people actually prefer the Metro Start Screen, some prefer the traditional (Windows 7) Start Menu, and some prefer the hybrid Start Menu introduced in 10.
The best solution, IMHO, is to incorporate the ability for users to switch between the following modes at-will:
Problem solved - everyone gets what they want.
One detail I noticed with the Preview (largely thanks to testing on such a minimal system) was how Windows 10 loads a 'compatibility shell' when using software intended for older versions of Windows.
This is by far one of the best features I have ever encountered using Windows - it keeps the OS lean and mean while still supporting older software. This is going to be a major selling point for businesses and I strongly encourage Microsoft to give this capability the dedication it deserves! (Should also include the ability to select/set such compatibility manually.)
Some people like the simplified visual themes from Windows 8/8.1 while others feel that it's 'unfinished' and prefer the Aero styling from Windows Vista/7. It should be a simple enough matter to make both features available through Desktop Themes.
Restore the ability to customize Desktop Themes, including the ability to alter the background color of content windows.
IE has a long-standing bad reputation for poor compatibility. Testing IE 11 (included in Preview) reveals it to only be 67% compatible with HML5 Standards and 45.2% compatible with CSS3 Standards. This lack of compatibility with industry standards is a major contributor to its minuscule (9%-18%, depending on source) market share among browsers.
Whatever version of Internet Explorer is included in the final release, Microsoft needs to do everything in their power to ensure that it is the most-compliant browser available from any source. Otherwise, it will remain the first thing to be uninstalled by computer enthusiasts.
An enormous peeve among computer users is how Windows 8/8.1 apps (including Office) only function fullscreen and cannot be windowed. These applications should automatically detect whether the system is operating in Metro mode or Desktop mode and operate accordingly - fullscreen in Metro, windowed in Desktop.
While convenient for some, many (myself included) do not want to tie our third-party accounts (Skype, Facebook, Twitter, etc) to a Microsoft Account. Even though the apps included with the Technical Preview list the option to sign in without a Microsoft Account, it is currently not functional. This needs to be corrected ASAP - definitely prior to actual release.
With desktop systems beginning to trend toward Harmonious System Architecture (such as with AMD's Kaveri-based A10-7850k APU) and the general increase in mobile devices (also mainly APU-based), Windows 10 (as a whole) should be specifically optimized towards this architecture. Likewise, 6- and 8-core CPUs are fairly commonplace, 16-core CPUs are already on the market, and 32- and 64-core CPUs are on the near horizon - Windows 10 needs to be able to take better advantage of these multi-core CPUs. (Yes, 8.1 and 10 already do this to some extent, but it needs improvement.)
Native Archive Support
Windows has featured native support for .ZIP files since way back when. Support for these archives in Windows 10, however, seems a bit lacking performance-wise. (It may just be that the system I tested with barely met minimum specs, but still.)
With the growing popularity of .RAR archives, it would be great if Windows 10 could include native support for this format as well.