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The following is the minimum folder hierarchy required for a PST:
Root Folder (section 2.7.3.4.1)
Top of Personal Folders (IPM SuBTree) (section 2.7.3.4.2)
Deleted Items (section 2.7.3.4.5)
Search Root (section 2.7.3.4.3)
Spam search Folder (section 2.7.3.4.4)