When comparing Outlook vs Trello, the Slant community recommends Outlook for most people. In the question“What are the best scheduling/calendar apps that syncs across desktop and iOS/Android?” Outlook is ranked 3rd while Trello is ranked 11th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Share individual events (tasks/projects/meetings)
You can easily and automatically create a stand-alone webpage for every single event. Add all the details for the event, then share the event page link with anyone who needs to help/be part of it. You can use comments to discuss details on the event page. Easy, free, makes it easy to collaborate on individual tasks or projects without a big setup.
Pro Powerful calendar
Integrate schedule with your task management --- because if you don't know when you're going to do it, are you ever going to?
Pro Small, dedicated team
Boot-strapped company, run by the original founders/developers, fully committed to supporting and improving the product over time. Over 3 million users currently
Pro Scalable
Works well for individual/personal work, free plan is more than adequate for this or for running a small business. Easy to scale if needed, paid plans available.
Pro Free mobile apps
For both iOS and Android. Free, fully functional.
Cons
Con Designed to be used with your email as well
Outlook isn't just a Calendar app, so the UI is a lot more complicated and has unnecessary components if you don't plan on using it for your email as well.