I added OX Mountain Lion yesterday at Apple Store. Now when I want to send email and I start to type first initial of recipient, it doesn't pick up name from content list. What to do? Where did

Mountain Lion and Lion do not recognize anything that was created under the power pc architecture. If you're connecting an older drive with power pc programs (G5 and before), then you'll have problems.

Try repairing disk permissions by running the Disk Utility application until you get no errors (then restarting).
Hope by doing that you get the solution.

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You should be able to install Mountain Lion using the Mac App store. Check the applications folder to find the App Store.

Make sure to back up your files before upgrading. After backing up, you will purchase the upgrade from the App Store. Once it has downloaded you'll be walked through the steps to upgrade.

Hope that helps!

You need to have bought your computer in mid June or so, after the 11th of the month. Go to the up to date place on Apple's website and see if you qualify if you dont it will be 20 dollars to purchase from the Apple Store.

Hello Patrick,

The most common problems I've experienced with Mountain Lion are the following:

• Reduced battery life. I've noticed about an hour to an hour and a half cut off from my battery life of my Macbook Pro. I'm not sure if this applies to you since you have a Macbook Air, but my recommendation is to try a reinstall if you experience battery problems and turn off some of the extra features like Twitter integration and iCloud when you're not using them.
  
• Safari is crashing. Safari is a browser that used to have little respect but now has actually gotten pretty decent. However, with Mountain Lion it actually crashes a lot more than usual. I don't have a fix for it offhand, but I would recommend just using Chrome (which I use anyways) or Firefox. And stay away from Explorer!
  
• Free upgrades to Mountain Lion. When I got my free upgrade to Mountain Lion (if you purchased a Mac after June 11, 2012 you can get one too) it took Apple about 5 days to upgrade me to Mountain Lion. This is a super low priority problem, but it's still something I hope they're working on.
  
• Notes synchronization. I have answered this on FixYa already, you can find it on the site.
  

Best of luck.

You can add your Twitter account, by visiting the System Preferences and the selecting Mail, Contacts, & Calendars. Once viewing this screen click the small + at the bottom of the left column. This will show you what types of accounts you can add.

Twitter is an option, just click, enter your twitter credentials and you should be off to the races and tweeting from Mountain Lion!

Hope that helps!

All you do is go into "System Preferences" and then click on "iCloud". From there you will be able to activate your account and proceed.

Please note that you will have to set up an @me.com email address from Apple. Without this you will not be able to sync between devices like you wish to do.

You can download Mountain Lion by going to the Apple Store. It costs $20 to get.

However, if you purchased your new computer after June 11, 2012 (which your question seems to indicate you did) then it will not cost you anything and will be completely free.

Go to this webpage and enter in your details to get your free copy.

You must have the following computer to download Mountain Lion:

iMac (Mid 2007 or newer)
MacBook (Late 2008 Aluminum, or Early 2009 or newer)
MacBook Pro (Mid/Late 2007 or newer)
MacBook Air (Late 2008 or newer)
Mac mini (Early 2009 or newer)
Mac Pro (Early 2008 or newer)
Xserve (Early 2009)

Once that is done, you must be updated to the most recent version of either Snow Leopard or Lion. If you don't have either of these operating systems (which is highly unlikely considering the other computers should have them, but I digress) then you will need to get them before Mountain Lion.

After that, go to the Apple Store and download Mountain Lion!