The document you refer to says that read status will be update after opening Mail on a device for MobileMe. So, according to this document an additional step was required to sync read status.
This document does not however address iCloud, which updates on all my devices automatically, whether it relates to receiving email, read status or deleting messages.
Well lets look at your reply
The first paragraph relates to MobileMe and as you confirm the read status will not update to all devices with out operator intervention so read status is not "Pushed" but user updated so result we agree
The second Paragraph is the interesting and some what encouraging one, as you seem to be saying that iCloud acts in true "push" mode for you, in the fact that the read status is pushed to all your devices, without any intervention from you
If this is the case you are the first person in the many threads on the matter to say this, and that's encouraging to the rest of us who are suffering with this
Apple are saying that iCloud like MobileMe will not update read status to all devices,
I wonder if any other readers of this thread are like you getting true read 'Push" on all devices
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The document you refer to says that read status will be updated after opening Mail on a device using MobileMe. It is also related to using only the Push setting. So, according to this document an additional step was required to sync read status. Can't verify this fine point as I'm no longer on MobileMe.
This document does not however address iCloud, which updates on all my devices automatically, whether it relates to receiving email, read status or deleting messages.
Just a point are you including an iPad, iPhone or iPod in you all devices claim