I was hoping there would be a tool (web and app accessible) that combines email, to-do, document sharing, calendars all into one, with easy access control for each 'file'. Target users are smallish startup teams. For example, apart from each individual email accounts, there are also team ones (e.g. sales@) which multiple people can see and 'claim'.
You can achieve something similar with multiple apps, but I would need to invite the same people for each, and setup access control. Gmail for business, Office365 type are somewhat similar, but they also do not put everything easily reacheable and connected. Good is also similar, but I believe they require you to host your own Exchange backend, but a hosted solution here is probably more hassle-free.