MACBOOK SAYS IT IS UP TO DATE BUT IT IS NOT

Choose About this Mac from the Apple menu and check the processor.

If it's a Core Duo Mac, click here, install the DVD, and run Software Update.

If it's a Core 2 Duo or better Mac, upgrade it as if it was a Core Duo Mac, open the Mac App Store, and try downloading 10.9. If you get told it's incompatible and if desired, go to the online Apple Store and order a download code for Lion 10.7.

Mac OS X 10.7 and newer don't support PowerPC software such as Microsoft Office 2004. If you upgrade the OS, back up the computer first.

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Actually your Mac is up to date. 10.5.8 is the last version of OS X Leopard. You are confusing updating OS X with upgrading OS X.

You will need to buy & install the retail install disk for OS X 10.6 Snow Leopard and then upgrade to OS X 10.6 8 to have the public version of the Mac App Store (MAS) on your Mac. Then, based on which Mac you have, you might be able to use the MAS to upgrade to OS X 10.7 Lion, 10.8 Mt Lion or 10.9 Mavericks. Lion and Mt Lion will cost you $20, Mavericks is free.

OS X Snow Leopard 10.6.8 v1.1 update combo

http://support.apple.com/kb/DL1399

OS X Upgrades -

A Mac that can run OS X 10.6 Snow Leopard can usually run OS X 10.7 Lion. And a Mac that can run OS X 10.8 Mt Lion can also run OS X 10.9 Mavericks. Lion, Mt Lion and Mavericks can all be installed over OS X Snow Leopard 10.6.8, so you may upgrade from Snow Leopard directly to any of the other three. Both Lion and Mt Lion are paid upgrades, while Mavericks is a free upgrade. You may also upgrade directly to Mavericks from either Lion or Mt Lion.

System requirements for OS X Snow Leopard & OS X Lion

http://support.apple.com/kb/ht4949

System requirements for OS X Mountain Lion

http://support.apple.com/kb/HT5444

System requirements for OS X Mavericks

http://support.apple.com/kb/ht5842

You need to follow the Core Duo instructions I posted above first regardless of the processor type. Once they're done, you'll have the Mac App Store.

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