Buy/Take control of VAWLT (or other multi-cloud systems)
I think Microsoft should buy or take control of VAWLT (https://vawlt.io/) or other similar multi-cloud systems. These systems open the cloud to everyone (no more concerns about security of a specific cloud provider).
VAWLT is based on "SCFS: a Shared Cloud-backed File System" USENIX’14 research paper (https://www.usenix.org/system/files/conference/atc14/atc14-paper-bessani.pdf).
It works by only storing ciphered data on the cloud and this data is also distributed among many cloud providers. It may be a more expensive solution, but it is the best solution available for industries which cannot rely on the cloud to store their data at the moment.
However, if this kind of systems becomes popular, then they would build an abstraction layer of cloud providers, and which could hinder the direct usage of clouds. By Microsoft taking control of this kind of system, they keep the control of cloud and allow other business to benefit from the cloud.