HINTS TO HELP YOU.
I’m organizing my emails in various subfolders which have subfolders of its own again. In addition, I’m using rules to move messages to their corresponding folder. Usually I keep this folder structure collapsed but then I can’t see if a message arrived in any of these subfolders.
Is there a way to make the parent folder show the combined amount of unread items in any of the subfolders?
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Show unread item count of collapsed folders | MSOutlook.info