Apple delivered a notable upgrade to the Mail app a few weeks ago, introducing intelligent categories to keep the inbox uncluttered and make discovery of relevant content easier. The trick, however, was limited to the mobile platform, and never appeared on Macs. That is about to change soon. In the latest edition of his PowerOn newsletter, Bloomberg’s Mark Gurman claims that Mail categories will finally make an appearance in the desktop client this April. The report notes that the change...