On Monday, VMware's CEO Pat Gelsinger stood on stage with Microsoft's CEO Satya Nadella to announce a new partnership.

The two companies have been bitter rivals for most of their existence.

Behind the scenes, Gelsinger explained at a Q session that, despite the news, VMware still viewed Amazon as its main ally in the cloud wars.

On Monday, it was a when-pigs-fly moment as VMware CEO Pat Gelsinger stood on stage with Microsoft CEO Satya Nadella to announce a partnership between their two companies.

Microsoft and VMware have been bitter rivals for decades — but this partnership brings VMware's software to the Microsoft Azure cloud.

It's especially notable because VMware has a major partnership with Microsoft's main cloud rival, Amazon Web Services.

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