Following a series rumors and leaks, Google on Tuesday unveiled a new cloud storage service being billed as the next step in the evolution of Google Docs. Dubbed Google Drive and built to compete directly with Microsoft’s SkyDrive and other similar services, Google’s new cloud storage solution features 5GB of free space and deep Google Docs integration that allows users to collaborate and share all of their documents. The enterprise-focused service can be upgraded to expand the amount of available storage, and packages start at 25GB for $2.49 per month. Microsoft SkyDrive features 25GB of free storage with the option to add 20GB for $10 per year, 50GB for $25 per year or 100GB for $50 per year. Google guarantees 99.9% uptime with its new Google Drive service, and it will launch Windows, Mac and Android Google Drive apps immediately with an iOS app to be made available in the coming weeks.