I have a 2017 client that is not on 100c, but I installed the workstation with the Standard Interface (thinking they were 100c because it was a new implementation and I thought it HAD to be that way). All the functionality is there except for stuff on the ""View"" tab. So you can't change the theme, alphabetize, or edit the Web Content. I left it alone, they liked the ribbon interface and the ease of the favorites ""tab"" and bar.