5
Spotlight Gets Smarter
Spotlight also works a bit like a silent version of Siri on iOS. Type in the name of a movie, for example, and Spotlight gives you links to nearby showings. If you're really intent on wasting time, click on some of the trailers that Spotlight also offers.
6
Safari Favorites
Safari gets a major makeover, with a single toolbar at the top (you can still display your old bookmarks bar by enabling it from a menu).
7
Keeping Tabs on Safari
In iOS, you can display a card-shuffle-style view of all your open pages in Safari. Yosemite gets a similar feature with its Show All Tabs view. You can open this view by clicking the button at the far right of the toolbar, with a keystroke, or from the top-line menu. Of course, the blank icon with the plus sign lets you open a new, empty tab.
8
Mail Tooltip
We'll get to the more eye-catching features in Mail in a moment, but here's one that a lot of users will appreciate: a dropdown menu that lets you quickly add a Bcc: and other address fields. Notice also the iOS-style light-colored plus icon at the right that replaces the garish button for adding addressees found in earlier version of OS X.
9
MailDrop Drops
Just when you got used to the routine of uploading a large file to Dropbox or some other service and sending a download link via Mail, along comes MailDrop, Apple's new service that lets you upload files up to 5GB in size to a 30-day storage site, and then it sends a download link in a mail message. It's all done in Mail, and it's blissfully simple. By the way, as far as we can tell, MailDrop isn't actually working yet, but our preview version of Yosemite at least let us see how it will work when it does.
10
Mail Markups
If you're used to opening up a graphics program to mark up images before sending them via Mail, you can now mark them up in Mail itself. Hover the cursor over an image in a Mail message, and a Markup menu becomes available. The next screen shows what happens when you click it.
11
Mail Gets Arty
The toolbar offers a basic set of drawing tools—boxes, lines, text, and so on—but the really nifty part is the way OS X converts your hand-drawn scrawl into a smooth line. I used my fingertip to draw a messy arrow on the trackpad, and Yosemite converted into this perfect Bezier curve with an arrowhead.
12
Preview Markups
The same markup feature is available in Preview for when you aren't mailing an image. Here you see the endpoints of the curve that OS X offers to draw in place of the scrawling curve that I drew using the trackpad.

13
Newly Appointed Calendar
Calendar gets a revamped all-day view, complete with new options in the drop-down menus. As in Contacts and other apps, the iOS and OS X Calendars now look a lot more like each other.
14
FaceTime and Phone
We weren't able to test the feature that lets you answer a call to your iPhone on your Mac, but there's the icon that will let you do it. Notice the phone icon added to the camera icon. When a call comes in on your iPhone, and the phone is in another room, you can click on the icon to talk and listen through your Mac's mic and speakers.
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Messages: Do Not Disturb
Messages gets a lot of new features built into a button at the upper right of the window, including an option to mute a chatty message thread that you don't want to deal with right now.
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AirDrop Options
The AirDrop file-transfer feature, which now works between iOS and Macs, lets you restrict AirDrop to devices owned by your contacts. It looks like one minor inconvenience will result from the new AirDrop technology in Yosemite and iOS 8—you have to choose a special option if you want to exchange files with a Mac running an earlier version of OS X.
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Extensions
A new panel in System Preferences lets you control extensions that Apple or third-party developers provide for the Notification Center and other apps that will support the new widget technology. Here I've added stocks and other features to the Notification Center.
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iCloud Passwords
Apple borrows a feature that Microsoft introduced in Windows 8—you can now use your iCloud password to log into OS X, instead of the traditional account password. However, you can continue to use old-style account passwords if you prefer.
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The Full Screen Button
The point of this screen isn't to show you the clean design of the Calendar but to ask you to notice the red, yellow, and green buttons at the upper left—and the absence of the old full-screen button that used to be at the upper right of many OS X apps. Yosemite ditches the old full-screen button and repurposes the green button to work as a full-screen button in apps that support full-screen mode. In apps that won't work in full-screen mode, the green button sets the window size to its default maximum, as it always did.
20
A Public Beta Program
Want to try Yosemite? If you don't have a $99 per year developer account, you'll be able to try it free by joining the
Yosemite public beta program—if you're one of the first million people to sign up. Apple won't say when the beta will go public, but now is the time to sign up.
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