Unmitigated disaster. I installed this on my phone as I wanted my Calendar to be more friendly to my personal schedule - I use a Microsoft calendar for work. In order to upload an attachment it must come from Google Drive, I keep all my attachments on my phone. Next I discovered that the option to view my Microsoft calendar has gone, I have to see both on my phone. There is a work around but it is so complicated, I wouldn't even consider it. Uninstalling it was equally complicated. FAIL