The new Mac OS X Lion is Here ,To upgrade your old Mac to new MAC OS X Lion, you don’t need to rush to a store,or don’t need to bring home a box pack to start a fresh install with bunch of discs!, sounds great ?
All you have to do is go to Mac App Store ,then buy Mac OS X Lion for $29.99, and your Mac upgrade wizard starts !. Just make sure you have the minimum requirements for Mac OS X Lion upgrade .

Step 1
Check your Mac meets the minimum requirements to install new Mac OS X Lion
Your Mac must have an Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor to run Lion.
To check if your current Mac has one of these processors,

click the Apple icon at the top left of your screen, then click on “About This Mac”.
Step 2
Check you have the latest version of Snow Leopard.
You must have to update to the latest version of Snow Leopard(version 10.6.8), in order to upgrade to new Mac OS X Lion.
Step 3
Ready to download.
if you meet all above requirements for new Mac OS X Lion then you are now ready to buy and download it from Apple App store ,after download follow the simple onscreen steps to install new Mac OS x Lion.
Thanks for sharing this useful info,i love mac Os lion.