In Outlook 2011, your Identity was located in Documents > Microsoft User Data folder. Identities are now called Profiles in Office for Mac 2016 (now available in preview). Your profile is no longer stored in Documents but in your User’s Library folder.
The User’s Library folder is hidden by default. To unhide: Select the Finder in the Dock. Under Go in the Menu bar > hold down the Option key and you’ll see the Library.
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Continue Reading: Location of Outlook 2016 Profile (Identity)