This was just posted on the Official Site moments ago:

Greetings Auraxians! We are pleased to announce to everyone that PlanetSide now supports both Windows Vista and Windows 7. While players could work around the compatibility issues with Vista and Windows 7 before, the client should now be completely functional without having to use compatibility mode and/or other tricks.

We appreciate your patience with this change and please make sure that you spread the word to all your fallen Vista and Windows 7 comrades!

Read on

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Head to PlanetSide.com to view this news post.