What type of inboxes do these icons represent

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Dec 28, 2022
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I've been trying to set up some Rules & Alerts on a shared mailbox in Outlook.

However, when I'm in the wizard it will not allow me to select any of the folders in the shared mailboxes. Before I start discussing this with my IT dept can someone confirm what the two different icons in the screenshot represent? Is it simply personal mailbox (Top icon) and shared mailboxes (bottom 4 icons)?

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