What to do when the Outlook reminders of iCloud elements arrive doubled.
It only appears as if they were doubled, but they are actually two different dialogues, one from Outlook and one from the Apple iCloud add-in. The developers of the iCloud add-in have simply recreated the reminder dialogue of Outlook and display their own copy for the iCloud store. Outlook now naturally also shows its own dialogue, because there are OLMixedFolders copies in the standard folder. The solution is to centrally switch off Outlook's own reminder function, because the Apple iCloud add-in cannot shut down its own reminders.