Mac OS X 10.7 Lion

Mac OS X 10.7 Lion introduces following new feature:
Full-screen apps
The app and nothing but the app.
On iPad, every app is displayed full screen, with no distractions, and there’s one easy way to get back to all your other apps. Mac OS X Lion does the same for your desktop. You can make a window in an app full screen with one click, switch to another app’s full-screen window with a swipe of the trackpad, and swipe back to the desktop to access your other apps — all without ever leaving the full-screen experience. Systemwide support allows third-party developers to take advantage of full-screen technology to make their apps more immersive, too. So you can concentrate on every detail of your work, or play on a grander scale than ever before.

Launchpad:
A home for your apps.
Launchpad gives you instant access to your apps — iPad style. Just click the Launchpad icon in your Dock. Your open windows fade away, replaced by an elegant, full-screen display of all the apps on your Mac. It takes just a swipe to see multiple pages of apps, and you can arrange them any way you like by dragging icons to different locations or by grouping apps in folders. And when you download an app from the Mac App Store, it automatically appears in Launchpad.
Ready to blast off.

Finder
The new finder has now more user friendly option and its sidebar with main list 1)FAVORITES 2) SHARED 3) DEVICES.

NEW MAIN new feature introduces in finder AirDrop and All My Files:
AirDrop:-
AirDrop has nothing in common with DropBox, a cloud-based file sharing service more akin to iDisk. Instead, AirDrop allows users to discover nearby users and share files with them directly, without needing to configure a common WiFi network.

Lion's new AirDrop makes basic file exchange between nearby users as simple as Bluetooth, as fast as WiFi, and as easy as drag and drop, with layers of security and personalization that combine with Apple's easily understandable user interface to make a conceptually complex task easy to initiate even for non technical users.

Send it by air.
With AirDrop in Mac OS X Lion, you can send files to anyone around you — wirelessly. AirDrop doesn’t require setup or special settings. Just click the AirDrop icon in the Finder sidebar, and your Mac automatically discovers other people nearby who are using AirDrop. You’ll even see contact photos for those who are already in your Address Book. To share a file, simply drag it to someone’s name. Once accepted, the file transfers directly to the person’s Downloads folder. When you’re done with AirDrop, close the Finder and your Mac is no longer visible to others.


All My Files:-
It show all you files in your Hard disk categarised like image, documents...

Now from all sides you can resize the Finder window.

Mission Control
Mac command central.
Mission Control is a powerful and handy new feature that provides you with a comprehensive look at what’s running on your Mac. It gives you a bird’s-eye view of everything — including Dashboard and full-screen apps — all in one place. With a simple swipe, your desktop zooms out to Mission Control. There you can see your open windows grouped by app, thumbnails of your full-screen apps, and Dashboard, arranged in a unified view. And you can get to anything you see in Mission Control with just one click. Making you the master of all you survey.

Auto Save
Past perfect.
Say good-bye to manual saving. Auto Save in Mac OS X Lion automatically saves your work — while you work — so you don’t have to. Lion saves changes in the working document instead of creating additional copies, making the best use of available disk space. The lock feature prevents inadvertent changes from being saved and automatically locks documents after two weeks. And the revert feature returns you to the state the document was in when you last opened it, so you can feel free to experiment with confidence.

Mail 5
A whole new way to look at email.
Just like Mail on iPad, Mail 5 in Mac OS X Lion features a new layout that takes advantage of the widescreen display on your Mac. You see the messages in your inbox as well as a full-height preview of the selected message. The new Mailbox bar gives you one-click access to your favorite folders. Mail 5 also includes a powerful new way to search that makes finding what you’re looking for quick and easy, even in the largest of inboxes.

Keep the conversation flowing.
Mail 5 also introduces Conversations, a natural new way to read and manage email that automatically groups messages from the same conversation — even if the subject changes along the way. Just click a conversation in your inbox to reveal a streamlined feed of individual messages in chronological order, and easily file or delete an entire conversation.

All-new FileVault
A new level of security.
Keep all the data on your Mac even more secure with XTS-AES 128 data encryption at the disk level. Initial encryption is fast and unobtrusive — it encrypts everything in the background while you work. FileVault also encrypts for your external drives, and provides the ability to wipe all the data from your Mac instantaneously.

Resetting synced information with MobileMe

After you’ve set up your computer to sync with your MobileMe subscription, you can reset the information you want to sync anytime you are connected to the Internet. Use the Sync pane of MobileMe preferences to set up the type of information you want to sync; for example, your contacts or calendars.

If you’re not sure you want to keep the changes made during your last sync, you can reset the information you want to synchronize on your computer to match the information on MobileMe, or you can reset the information on MobileMe with the information on your computer.

You may also want to reset your information if you’ve had problems syncing and want to “start over.”

You need to be connected to the Internet to sync with MobileMe.

To reset sync information:
Choose Apple > System Preferences, and then click MobileMe.

Click Advanced, select the computer you want to use, and then click Reset Sync Data.

Choose the sync information you want to reset, such as Bookmarks, Keychains, or All Data from the Replace pop-up menu.

Click the arrow pointing toward the computer icon to copy the information from your MobileMe account to your computer. This replaces the information on your computer with the information on MobileMe. Click the arrow pointing toward the MobileMe icon to copy the information from your computer to your MobileMe subscription. This replaces the information on MobileMe with the information on your computer.

Using the Reset Sync Data command erases the information on your devices and replaces it with the information from the source you selected.

Resetting your keychain in Mac OS X

check keychains for problems using Keychain First Aid:

Open Keychain Access, located in the Utilites folder in the Applications folder.


1)Choose Keychain Access > Keychain First Aid.

2)Enter your user name and password.

3)Select Verify and click Start. Any problems found will be displayed.

4)If there are problems, select Repair, and then click Start

To change the Keychain First Aid settings, choose Keychain Access > Preferences, and then click First Aid.

Symptoms
If Keychain First Aid finds an issue that it cannot repair, or if you do not know your keychain password, you may need to reset your keychain. (Resetting a keychain sets aside the original default keychain file and creates a new one.)

Resolution
>>>To reset your keychain in Mac OS X 10.4, Mac OS X 10.5, and Mac OS X 10.6 Snow Leopard or later:

Open Keychain Access, which is in the Utilities folder within the Applications folder.
1)From the Keychain Access menu, choose Preferences.
2)Click General, then click Reset My Default Keychain.
3)Authenticate with your account login password.
4)Quit Keychain Access.
5)Restart your computer.

>>>To reset your keychain in Mac OS X 10.3 through 10.3.9:

1)Open Keychain Access, which is in the Utilities folder within the Applications folder.
2)From the Window menu, choose Keychain First Aid.
3)Click Options...
4)Click Reset My Keychain, which is under the General pane.
5)Authenticate with your account login password.
6)Quit Keychain Access.
7)Restart your computer.