Board Thread:Lore Discussion/@comment-24583421-20140302161145/@comment-24261859-20140303050724

Aedra cannot interact with the mortal world like Daedra can, as they represent creation and stasis while the Daedra represent change. That said, since praying at their shrines confers some kind of observable benefit, it might indicate that they do have some manner of presense.

Furthermore, there is Florentius' "communication" with Arkay, which could just be insanity, but he does seem to posess an unnatural foresight and knowledge of manners he could not know otherwise.