Via Engadget
 
By Ross Rubin
 
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Last week's Switched On discussed
 how Lion's feature set could be perceived differently by new users or 
those coming from an iPad versus those who have used Macs for some time,
 while a previous Switched On discussed
 how Microsoft is preparing for a similar transition in Windows 8. Both 
OS X Lion and Windows 8 seek to mix elements of a tablet UI with 
elements of a desktop UI or -- putting it another way -- a 
finger-friendly touch interface with a mouse-driven interface. If Apple 
and Microsoft could wave a wand and magically have all apps adopt 
overnight so they could leave a keyboard and mouse behind, they probably
 would. Since they can't, though, inconsistency prevails.
 
Yet, while the OS X-iOS mashup that is Lion
 exhibits is share of growing pains, the fall-off effect isn't as 
pronounced as it appears it will be for Windows 8. The main reasons for 
this are, in order of increasing importance, legacy, hardware, and 
Metro. 
 
 Legacy. Microsoft has an incredibly strong commitment 
to backward compatibility. As long as Microsoft supports older Windows 
apps (which will be well into the future), there will be a more 
pronounced gap between that old user interface and the new. This will 
likely become more of a difference between Microsoft and Apple over 
time. For now, however, Apple is also treading lightly, and several of 
Lion's user interface changes -- including "natural" scrolling 
directions, Dashboard as a space, and the hiding of the hard drive on 
the desktop -- can be reversed. Even some of Lion's "full-screen" apps 
are only a cursor movement away from revealing their menus.
 
 Hardware. As Apple continues to keep touchscreens off 
the Mac, it brings over the look but not the input experience of iPad 
apps, relying instead on the precision of a mouse or trackpad. 
Therefore, these Mac apps do not have to embrace finger-friendliness. In
 contrast, the "tablet" UI of Windows 8 is designed for fingertips and 
therefore demands a cleaner break with an interface designed for mice 
(although Microsoft preserves pointer control as well so these apps can 
be used on PCs without touchscreens).
 
 Metro. A late entrant to the gesture-driven touchscreen
 handset wars, Microsoft sought to differentiate Windows Phone 7 with 
its panoramic user interface. When Joe Belfiore introduced
 Windows Phone 7 at Mobile World Congress in 2010, he repeatedly noted 
that "the phone is not a PC." That's an accurate assessment, and perhaps
 one worth repeating in light of all the feedback
 Microsoft ignored over the years in the design of Pocket PC and Windows
 Mobile. It also of couse holds true beond the user interface for design
 around context and support of location-based services.
 
But now that the folks in Redmond have created an enjoyable phone 
interface, have things actually changed? Was it true only that the phone
 and PC shoud not have the same old Windows interface, or is it also 
still true that the PC and phone should not have the same new Windows 
Phone interface? Was it the nature of the user interface itself that was
 at fault, or the notion of the same user interface across PC and phone 
regardless of how good it is?
 
There is certainly room for more consistency across PCs, tablets and 
handsets. However, Microsoft did not just differentiate Windows Phone 7 
from iOS and Android, it differentiated it from Windows as well. And that
 is the main reason why the shift in context between a classic Windows 
app and a "tablet" Windows 8 app seems more striking at this point than 
the difference between a classic Mac app and "full screen" Lion app. 
Lion's full-screen apps could be the new point of crossover with Windows
 8's "tablet" user interface mode. Based on what we've seen on the 
handset side, it is certainly possible for developers to write the same 
apps for the iPhone and Windows Phone 7, but these are generally simpler
 apps (and then there are games, which generally ignore most user 
interface conventions anyway).
 
Apple and Microsoft are both clearly striving for a simpler user 
experience, but Microsoft is also trying to adapt its desktop OS to a 
new form factor in the process of doing so. The balancing act for both 
companies will be making their new combinations of software and hardware
 (from partners in the case of Microsoft) embrace a new generation of 
users while minimizing alienation for the existing one.
 
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