Periodicals on the Sony aren't plain ePub. They have a couple extra metadata files that need to be present and populated before it will pick it up as a periodical. I dont think calibre ever got the support to do it, even though I sent a couple samples to the author awhile back when the 900 was new and I wrote my own RSS->ePub tool.
These "special" epubs really just enable the jumping to next article functionality in the Sony, and work fine on other ePub readers.
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