As we confirmed earlier in our earlier Post, Vodafone Australia confirmed on their twitter testing Android OS 2.3 named as Gingerbread on 4 kind of devices, and Galaxy Tab is one of them.

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to view some articles about the same check below links:

http://androidcommunity.com/vodafone-australia-test-android-23-gingerbread-on-galaxy-tab-20110419/

http://www.gizmocrunch.com/android/6546-samsung-galaxy-tab-android-gingerbread