Public Folders Failing To Sync
If your Mailbox Level backup is failing with this error ( Failed to sync changed items for folder "Exchange\Mailboxes\"domain"\Public Folder\"Public Folder Name" ) you will want to check the permissions for the "user" backing up these folders.
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Open Exchange Management Console
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Click on "Toolbox"
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Double click on "Public Folder Management Console"
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Click "Default Public Folders" to populate folders inside the console.
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Highlight folder in question then click properties on the right
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Make sure the "user" gets selected and it has these permissions "Create items, Read items, and Edit all. "
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Once complete repeat on all folders necessary and re-run Mailbox backup.