For Thunderbird, you set up Calendars as being on a network – that is they exist as .ics files (the same that Outlook uses) in a common are, in your Cloud, and each device refers to these when displaying its calendar.
For Outlook go to Options and add Internet Calendars.
As a suggestion I have calendars for…
Six Nations Rugby
Bar Billiards fixtures
Each displays in a different colour and can be turned off when not need or out of season!
To sync with my phone and tablet, as I don’t connect, yet, to a Cloud and am on Android, I use MyPhoneExplorer on PC and phone/tablet. They can connect and sync by WiFi, cable, or Bluetooth.
If you need help in any area of IT or Technology contact me
0780 244 1728 / firstname.lastname@example.org / www.iseberg.co.uk