Until further notice, Amazon Web Services is the reigning public IaaS cloud leader. But deep-pocketed companies Microsoft and IBM are keeping the pressure on AWS with a flurry of announcements beefing up their clouds to close out the year.

IBM, which earlier this year committed to investing $1.2 billion in its cloud platform, is accelerating its roll-out of new data centers across the globe. Initially the company said it planned to open 40 cloud sites, but this week it announced that 48 are available, some of which are made available through partnerships with hosting providers like Equinix. The company claims robust enterprise adoption traction, reporting that its cloud division works with 47 of the top 50 Fortune 500 companies.

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