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Which one is better and why? 1) Are you an Ozibox user? 2) Are you a Ozibox user?

Ozibox is the name of a web application

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marked as duplicate by waiwai933♦ Mar 5 at 20:06

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In this case, use #1. The rule goes that one should use "an" before vowels unless the word begins with a consonant sound or the Y sound. In your example, "Ozibox" begins with the "o" vowel sound. See here for more info.

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If someone wrote "a Ozibox user" I would assume either they are not a native speaker of English, or "Oziblx" has some pronunciation not obvious from the spelling. (Maybe it is actually pronounced "wuzzibox", for example.) – GEdgar Mar 5 at 19:25

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