If you open an item to read it, and then decide you want to read the item later, you can mark the item Unread. Marking the item Unread changes the item to bold and changes the item’s icon to unopened so you know you still need to read the item.
In the Mailbox, click the item in the Item List.
Clickat the top of the Item List.
If you have opened an item, marking it Unread does not change the status of the item in Properties. For example, if you have opened an item, then marked the item read later, the sender of the item still sees the item status as opened in the Properties window.
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