I think that your office version is collecting your data (probably written from you in previous moments), and Microsoft is asking if you want to send a selection of your data to improve their software.
If you like the idea, you can send that information to Microsoft.
I don't read anything of private there, and helping a Microsoft product is not a bad thing.
If you have a different opinion about it, you can confirm this entry in blue "Don't send, and don't ask me again".
You decide.