FastMail's files is the only one I can use at work in Windows explorer.
Dropbox and Google Drive applications (synchronizing with the file system) are blocked by the corporate firewall.Dropbox and Drive are accessible through a browser. I haven't tried OneDrive and I am not a runbox user. Fastmail files can be defined as a Network Location in Windows explorer, using Webdav or FTP, and I guess the reason it works is that Webdav works over http, so to the firewall it looks like ordinary web traffic. It is as safe as accessing mail using a mail client (requires an app password set up for Webdav access).
But then most of the time I use Dropbox in Firefox at work and the dropbox application at home.
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