Odoo has a calendar and contacts which is great for integration. But everyone has a smartphone ... for me a good way of keeping those in sync is missing if you are using the community edition (and thus can not use the odoo app).
I can't believe there does not seem to be a module or so that exposes a private .ics url so you can add it to your iphone and have your odoo appointments available in your phone.
How do you community edition users solve this problem ?