How to sync Apple Reminders with Microsoft To Do

https://zapier.com/blog/sync-apple-reminders-with-microsoft-to-do-and-zapier/

1. To get started, you're going to need a Microsoft account. If you've ever used Windows, Microsoft Office, or Outlook Online, you already have one, but if not, create an account here. 

2. Log in to Microsoft To Do.

3. Create a task, so you can tell when the syncing is working.

4. With Microsoft To Do working, it's time to sync it with Apple's Reminders. Open System Settings on your Mac or Settings on your iPhone or iPad. 

5. Click on Internet Accounts, then hit the Add Account button.

6. Click the Microsoft Exchange option. 

7. Enter the email address and password for your Microsoft account. It will likely fail to log in and offer more details. Under User Name, put your email address. Under Internal URL and External URL enter outlook.office365.com.
   Note that, if your Microsoft account has two-factor authentication enabled, you're going to need to create an app password, or you won't be able to log in. 

8. Once you log in successfully, you'll be asked which services you want to sync. I recommend only syncing Reminders unless you specifically want the other services to sync.

You should be set now! Open Reminders on your device, and you'll see there's a new Exchange section, and that your tasks show up.

It's not perfect: new lists you add won't have the same name, for example. You can rename them quickly enough, though, after which everything should be working the way you expect. Any tasks you add to these lists will show up in Microsoft To Do, and any tasks you add in Microsoft To Do will show up here.

Note that you will have to repeat this process for all of your devices—adding your Microsoft account on your Mac doesn't add it on your iPhone, for example. Once you've set it up everywhere, however, you're done: everything will now sync without you having to pay attention.