Mailing it in
For many of us, Mavericks's version of Mail was an unmitigated disaster. It took several updates before Gmail users could get back to the same level of functionality and reliability they had in Mountain Lion, and even now some users of both Google's service and Microsoft Exchange continue to have problems. Given how much most of us still rely on email every day, it's up to 10.10 to make Mail the reliable bulwark that it needs to be.
Of course, that doesn't mean that we don't want improvements — we are, at heart, greedy little users. Some of those could be simple: the ability to specify a default address for those of our contacts who often seem to acquire them in bulk; the addition of categories that allow us to better weed out all that email that we don't want; and more powerful filtering rules. But, from a more zoomed-out perspective, Apple might want to reconsider exactly how we're using email these days. On the iOS side, we've seen interesting entries from the likes of Mailbox, Dispatch, and Accompli — it's time for the Mac to see if it can't learn something from its mobile sibling.
Return of the QuickTime Pro
Once upon a time, QuickTime Pro was among the Mac OS's best kept secrets. Not only did the $30 upgrade to Apple's built-in media player let you play movies to your heart's content, it also featured a surprisingly powerful bevy of editing tools, letting you quickly trim movies, work with multi-track MOV files, and more. QuickTime Player X might shine at the content-consumption side of the equation, but as an editing tool it leaves a lot to desire. Surely, there's some middle ground between the basic features it offers and the often-unneeded complexity of iMovie. If nothing else, we'd like to see some more powerful upgrades to some of the capabilities it already has — the ability to do a screen capture of a single window, for example, would be a boon to those of us in the screencast business.
For your (multiple) displays only
Apple made strides with its multiple-display support in Mavericks, but given the state of said functionality in Lion and Mountain Lion, the bar was pretty low. Still, there's further room for improvement here: The feature often works unreliably, with apps launching on an unexpected screen, or windows failing to correctly remember where they were when switching between single and multiple monitor setups. Given that many power users are buying the new Mac Pro for its ability to support multiple 4K monitors, we're guessing that robust multiple-display support might soon be a priority.
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