Why is my macbook air not compatible with mountain lion?

When i want to buy montain lion in the app store i get the message that my machine (Macbook air) is not compatible. Why is that and can i do something to solve that problem?

Because your model is old and does not support the 64-bit EFI ROM requirement to install Mountain Lion. If you meet the 2 GB RAM requirements you could install Lion:
Upgrading to Snow Leopard, Lion, or Mountain Lion
You can upgrade to Mountain Lion from Lion or directly from Snow Leopard. Mountain Lion can be downloaded from the Mac App Store for $19.99. To access the App Store you must have Snow Leopard 10.6.6 or later installed.
Upgrading to Snow Leopard
You must purchase Snow Leopard through the Apple Store: Mac OS X 10.6 Snow Leopard - Apple Store (U.S.). The price is $19.99 plus tax. You will be sent physical media by mail after placing your order.
After you install Snow Leopard you will have to download and install the Mac OS X 10.6.8 Update Combo v1.1 to update Snow Leopard to 10.6.8 and give you access to the App Store. Access to the App Store enables you to download Mountain Lion if your computer meets the requirements.
     Snow Leopard General Requirements
       1. Mac computer with an Intel processor
       2. 1GB of memory
       3. 5GB of available disk space
       4. DVD drive for installation
       5. Some features require a compatible Internet service provider;
           fees may apply.
       6. Some features require Apple’s MobileMe service; fees and
           terms apply.
Upgrading to Lion
If your computer does not meet the requirements to install Mountain Lion, it may still meet the requirements to install Lion.
You can purchase Lion by contacting Customer Service: Contacting Apple for support and service - this includes international calling numbers. The cost is $19.99 (as it was before) plus tax.  It's a download. You will get an email containing a redemption code that you then use at the Mac App Store to download Lion. Save a copy of that installer to your Downloads folder because the installer deletes itself at the end of the installation.
     Lion System Requirements
       1. Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7,
           or Xeon processor
       2. 2GB of memory
       3. OS X v10.6.6 or later (v10.6.8 recommended)
       4. 7GB of available space
       5. Some features require an Apple ID; terms apply.
Upgrading to Mountain Lion
To upgrade to Mountain Lion you must have Snow Leopard 10.6.8 or Lion installed. Purchase and download Mountain Lion from the App Store. Sign in using your Apple ID. Mountain Lion is $19.99 plus tax. The file is quite large, over 4 GBs, so allow some time to download. It would be preferable to use Ethernet because it is nearly four times faster than wireless.
     OS X Mountain Lion - System Requirements
       Macs that can be upgraded to OS X Mountain Lion
         1. iMac (Mid 2007 or newer)
         2. MacBook (Late 2008 Aluminum, or Early 2009 or newer)
         3. MacBook Pro (Mid/Late 2007 or newer)
         4. MacBook Air (Late 2008 or newer)
         5. Mac mini (Early 2009 or newer)
         6. Mac Pro (Early 2008 or newer)
         7. Xserve (Early 2009)
     Are my applications compatible?
         See App Compatibility Table - RoaringApps.
     Am I eligible for the free upgrade?
         See Apple - Free OS X Mountain Lion upgrade Program.
     For a complete How-To introduction from Apple see Upgrade to OS X Mountain Lion.

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  • Are all MacBook Air laptops compatable with Mountain Lion

    Can I upgrade to Mountain Lion?

    If your model is a Late 2008 or later.
    Upgrading to Snow Leopard, Lion, or Mountain Lion
    You can upgrade to Mountain Lion from Lion or directly from Snow Leopard. Mountain Lion can be downloaded from the Mac App Store for $19.99. To access the App Store you must have Snow Leopard 10.6.6 or later installed.
    You can purchase Snow Leopard by contacting Customer Service: Contacting Apple for support and service - this includes international calling numbers. The price is $19.99 plus tax. You will receive physical media - DVD - by mail.
    Third-party sources for Snow Leopard are:
    Snow Leopard from Amazon.com
    Snow Leopard from eBay
    After you install Snow Leopard you will have to download and install the Mac OS X 10.6.8 Update Combo v1.1 to update Snow Leopard to 10.6.8 and give you access to the App Store.
    You can purchase Lion by contacting Customer Service: Contacting Apple for support and service - this includes international calling numbers. The cost is $19.99 (as it was before) plus tax.  It's a download.
    Be sure your computer meets the minimum requirements:
    Apple - OS X Mountain Lion - Read the technical specifications.
    Macs that can be upgraded to OS X Mountain Lion
      1. iMac (Mid 2007 or newer)
      2. MacBook (Late 2008 Aluminum, or Early 2009 or newer)
      3. MacBook Pro (Mid/Late 2007 or newer)
      4. MacBook Air (Late 2008 or newer)
      5. Mac mini (Early 2009 or newer)
      6. Mac Pro (Early 2008 or newer)
      7. Xserve (Early 2009)
    Are my applications compatible?
    See App Compatibility Table - RoaringApps - App compatibility and feature support for OS X & iOS.
    Am I eligible for the free upgrade?
    See Apple - Free OS X Mountain Lion upgrade Program.
    For a complete How-To introduction from Apple see Apple - Upgrade your Mac to OS X Mountain Lion.
    Model Eligibility for Snow Leopard and Lion.
    Snow Leopard General requirements
      1. Mac computer with an Intel processor
      2. 1GB of memory
      3. 5GB of available disk space
      4. DVD drive for installation
      5. Some features require a compatible Internet service provider; fees may
          apply.
      6. Some features require Apple’s MobileMe service; fees and terms apply.
    Lion System Requirements
      1. Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7, or
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      2. 2GB of memory
      3. OS X v10.6.6 or later (v10.6.8 recommended)
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