Microsoft apps always eating up space with data, for apparently no reason

Microsoft apps (Excel, PowerPoint, Word) use up space apparently for no reason. At this point, I do not use them. I am using a Samsung J7 with Android 6, with 16Gb internal storage and no SD card. Since I often run out of space, I check which apps are using it. I always find Microsoft apps are taking up space **for data**, and this seems strange to me. For instance, I go to *Settings* -> *Applications* -> *Application Manager* -> *Word* -> *Storage*, and I see: Total 256 MB App 104 MB Data 152 MB *Why would Word use 152 MB **of Data**, if I did not read/use any?*
I hit CLEAR DATA not long ago, and I checked that the corresponding storage space was actually freed to 0 MB. Now it is taking again 152 MB.
*What are those data?*
It is not that much space, but in my case it makes a difference. Excel and PowerPoint behave similarly. A stranger case seems to be OneNote, with Total 3.89 MB App 0 MB Data 3.89 MB **EDIT**: Now, two days after the initial post, Word takes up 16 kB. That is fine. I will check periodically to see when it increases Data size. **EDIT**: A couple of months after the initial OP, without using any of the apps, Excel had 251Mb of Data.