Microsoft People

Like most things Windows 10 mobile, it is, by far, better than anything Droid. Integrates fully with all my Windows 10 Desktop, Laptop and other Windows 10 smart devices. I have a Droid 7.0 smartphone and a Google/Gmail account People easily integrates with. I have only played around with IOS systems, so I don't know how well People (contacts) and Calendar, etc, is allowed to integrate with Appo systems.

The app is functional, however it looks out of place with circles. Please bring back the square pictures.

The contact details page uses your theme's accent colour as the background colour! It's a jarring change from the rest of the OS look and feel, not to mention ugly. The circular profile pictures don't go with the OS either. Cameras don't take circular pictures, not sure why the OS design team insists on making them so. The app retains most of the feature set from WP 8.1 otherwise.