I’m confused

Manual compact Inbox folder does not work. But automatic compact works (SOLVED)

My Thunderbird ver 3.1.9 running on Windows 7 Home Premium won't compact my Inbox. For other folders (under Local Folders) it offers a context-menu (right-click) selection of Compact Folder, but the context menu for the Inbox does not offer the Compact option. Also, the global compact function from the File menu does not affect the Inbox file size. My Inbox is getting big (close to 400 MB), and I want to compact it - just for the sake of getting a smaller backup.
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