Apple’s Mac OS X Lion Preview

released its developer preview of Lion where the installation process does'nt change the existing settings and , the menu bar shows the current user, there is an increase in size in its drop down menu, grouped buttons come with slider, decrease in size of buttons in the left-corner, scroll bars hide when not needed and again appear when you need them and also there is an option to keep them permanently or even can change to auto option, sidebar has new options like Air Drop (where you can send files to anyone around you – wirelessly, does'nt need any special setups it automatically finds other people nearby using AirDrop on clicking the AirDrop button).

The other feature is All new FileVault which keeps all data secure  with XTS-AES 128 data at the disk level, and also encryption is done for external drives. We can also change our scrolling directions from System Preferences, buttons have square edges rather than curved ones as in their previous versions, also pop-open in a similar way as the applications when launched on .

The green button on the top left corner increase and decrease window size, can be done either through arrow keys or grid view is available  if multiple files are marked, and these UI changes are optional so the user can revert back and they appear to be as in their previous versions

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