vertical enclosure required for stair?

Given a 2 story B occupancy non sprinklered structure - one stair inside and the second required means of egress is provided by an exterior stair. Will the interior stair require an enclosure due to the exterior stair being "open" or does this only apply to interior stairs - Code is the 2006 IBC.
Thanks in advance
Original Post
I received an interpretation form the ICC on this and they have indicated that the open interior stair would be allowed and the exterior stair is open as well (as required). They also said thet the exception for open stairs (#8) has moved from the exit enclosure section to the exit access section - never thought that it would be allowed but there you go!

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