Thanks knottyrope, this taught me a lot on how BES handles Exchange input about read/unread status! I've set 'Hard deletes reconciliation' to 'True', and re-saved the settings on her BB.
We'll see tomorrow if this solved the issue. She told me the read status of some recent mails was immediately updated, but I think it's too soon to make a conclusion.
I'm glad I got a good answer this fast, thanks again!
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