If a user is a "View only" collaborator in a folder on Box and they attempt to open a file with a program like Excel through Box Drive, they will receive an error message from Box Drive about not having permissions to save changes. This happens even if no changes are made, and the user is left with 'unsynced' files they must reconcile.

In a similar experience on a "real NTFS" volume, Excel would display "Read-Only" beside the title of the file. No errors would be displayed unless the user attempted to actually save to the directory.

Excel is not being made aware of the permissions in place ON Box and only sees the R/W permissions for the Users' local drive.
This might affect other applications, but Excel is where we ran into it.