Re: Linux to the rescue! Again!
"Not least an OS shouldn't ever 'support cloud storage'"
It depends what you mean by "support" and, indeed, "cloud storage".
In a lot of cases the latter just means some form of remote synchronisation. ownCloud and Kolab are both OSS S/W which provide Linux clients for this and Dropbox is one of several commercial products which do the same. As the OS supports these clients then it's reasonable to describe it as supporting this style of cloud storage as a client in the same way as saying it supports a web browser or an office suite. And don't forget older flavours of syncing such as rsync.
At a more fundamental level of support, and taking "cloud storage" to mean remote storage in general, Linux has both NFS and CIFS available at kernel level which can let a client integrate remote file systems directly into its own tree.
Looking at it from the other side any Linux system can be set up to offer ownCloud, Kolab, NFS and/or CIFS as a service. I wouldn't be surprised if the Dropbox service was also running on top of Linux - in fact I'd be surprised to hear that it wasn't. Linux can also host VMs and containers to provide other cloud services.
The OP's claim was complete nonsense typical of the once common but now almost silent crowd of Microsoft boosters.