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2.2.2.2.1.6 PidTagFolderId Property

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Type: PtypInteger64 ([MS-OXCDATA] section 2.11.1)

The PidTagFolderId property ([MS-OXPROPS] section 2.702) contains a FID structure ([MS-OXCDATA] section 2.2.1.1) that uniquely identifies a folder.