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Thunderbird: Offline sync for imap inbox with subfolders not working

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I am running Thunderbird 60.2.1 (64-bit) on my Macbook Pro. I am trying to use the offline and global search features. I have it set to sync all folders and all subfolders. However, when I synchronize (either with or without Go offline afterwards), it fails to download the messages in my inbox. It seems to download all other folders, and the subfolders of my inbox. But not the messages in the Inbox itself. This is most easily visible in what's available once I go offline.

I am running Thunderbird 60.2.1 (64-bit) on my Macbook Pro. I am trying to use the offline and global search features. I have it set to sync all folders and all subfolders. However, when I synchronize (either with or without Go offline afterwards), it fails to download the messages in my inbox. It seems to download all other folders, and the subfolders of my inbox. But not the messages in the Inbox itself. This is most easily visible in what's available once I go offline.

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Some more details:

inbox has 38283 messages. Thunderbird says that the size on disk is 2.0 GB.

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Also interesting: I have tried Repair Folder. It seems that it hangs once it hits about 38000 messages.