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Microsoft aims to make most of its money in the immediate future by convincing every major business in the world to let MS host that company's email, internal documents, spreadsheets and powerpoints on Microsoft's office365 servers.

It would be highly contradictory for MS to take the position, as a matter of policy, that it is too risky for them to ever place confidential business data onto a third party cloud-hosted SaaS system, because that is precisely the risk they are asking every one of their customers to take.

Similarly, if you have concerns about putting your company's source code into GitHub now, you should be equally concerned about putting your company's prerelease annual report on the office365 onedrive.

My company is concerned about that as well. We don’t use any cloud storage from Microsoft or anyone else, and we self host Exchange and SharePoint servers.

That is a good point though, it’s becoming more and more inconvenient for a company to self host everything. Microsoft does stand to benefit from everyone becoming more accustomed to relying on 3rd party services in the cloud.

Serious question: do you think your company has better security than the Azure cloud? Or is it a trust issue with the cloud vendors themselves?

.... and if you don't trust Microsoft: Why use Exchange and such? :-)

Better is relative - especially in one metric: many eggs in one basket make that basket exponentially more attractive to evil actors. Bigger attack surface and whatnot...

Flipside (pro-cloud pov): if the work to protect one egg applies to all eggs, then cloud providers will always hypothetically be able to spend more on security due to economies of scale

Essentially, choose your vulnerability: cloud provider single point of failure or in-house lack of resources

Yup. It all boils down to a business decision, the technical merits are not prevalent for either case.

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