I had some old folderish content from Plone 2.5 and when i tried to migrate this to Plone 4 it was not working correctly. I was getting
AttributeError: has_key
exceptions from Products.BTreeFolder. I also found this article describing this problem:
http://plone.org/documentation/error/nonetype-keys
but no clear solution.
It turns out that ATContentTypes 2.0 changes the ATFolder implementation to use BTreeFolder as the base class. Thankfully a migration view is provided called "migrate-btrees" that will migrate all the folderish items under the given path.
At the end I got a nice message in my log:
2010-05-31 22:23:35 INFO plone.app.folder.migration processed 3490 object(s) in 10.864s (10.640s cpu time)
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