On the heels of improved iCloud integration in Mountain Lion, Microsoft made things a little more official today for its upcoming updated SkyDrive cloud service for Windows 8 and possibly OS X. The new service will include improved file management and synchronization, secure two-factor authentication for remote access to files not yet uploaded to Skydrive, and support for file uploads of 2GB. What makes things interesting are rumors of paid storage options and a Mac client originating from Gemind.com.br who posted (via ArsTechnica) screenshots from Windows Live of SkyDrive advertising clients for “PC or Mac”…

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As for storage, the screenshots show options to add an extra 20 GB, 50 GB, or 100 GB to the default 25 GB for $10, $25, or $50 yearly. That’s compared to the 10 GB, 20 GB, or 50 GB of additional iCloud storage for $20, $40, or $100/year. Of course, purchased music, apps, books, and TV shows from iTunes, as well as images in Photo Stream, do not count toward iCloud’s free 5GB. A Mac client for the new SkyDrive that is rolling out in the next few months will not be a huge stretch, because Microsoft already released an iPhone client for the service in December.