Fujitsu

Strengths: Fujitsu has a large global sales force that can lean on strong IT services outsourcing businesses in Asia and Europe.

"This gives it a large existing base of captive customers into which it can sell cloud services," according to Gartner.

Fujitsu has been successful at extending those existing relationships into cloud deals, maintaining responsive support and good account management for customers.

Cautions: K5, the new platform Fujitsu intends to expand globally throughout 2017, doesn't have a significant operational track record, according to Gartner. It also doesn't do much to add capabilities beyond S5, which lags significantly behind market leaders, or improve the user experience.

"K5 IaaS provides a better foundation for the future than S5, but Fujitsu will continue to need to aggressively invest in acquiring and building technology in order to be competitive in this market," the research firm said.