From March 2019 Dropbox has limited the free, Basic version to support max 3 devices.
It gave me a real scare, as I am using Dropbox for all my Office files. I have 12 bootable partitions
on my Multi-Boot PC, all with Dropbox installed. They all link to the Dropbox folder of my main Windows
partition - which acts sort of like a "Server".
On a Multi-Boot PC each partition is considered a device. Furthermore, it seems as every time you link it is counted
as a new device! I had to unlink over 100 "devices" to end up with just 3 syncronizing devices.
View Video 2½ min
As linked I kept only the main PC partition, my tablet and my mobile phone. Only then did I read the Dropbox
FAQ which informs that you do not have to unlink your old devices - it is only when you try to relink a
device that they enforce the limitation.
You can still login to the Dropbox Cloud using a browser or an Android File Manager. The limitation
to 3 devices refers to syncronization.