Q: outlook calendar one way sync with icloud

Hello there, Dianne.

It sounds like you're trying to synchronize content from Outlook Calendar with iCloud for Windows on your PC. The following Knowledge Base article provides some explanation for iCloud functionality with Outlook:

Get help using Outlook with iCloud for Windows

Calendar, Contacts and Reminders

If you need help with your Calendar, Contacts and Reminders with iCloud for Windows, try these steps. 

When you open iCloud Reminders on your Windows PC, they're labeled Tasks and appear within the Tasks section.

Turn iCloud Calendar, Contacts and Reminders off and back on

1. Close Outlook.
2. Open iCloud for Windows.
3. Deselect the Mail, Contacts, Calendars & Tasks checkbox and click Apply.
4. Wait a few seconds. Select Mail, Contacts, Calendars & Tasks, and click Apply.
5. Open Outlook.

Make sure that the iCloud Outlook Add-in is on

The iCloud Outlook Add-in transfers your content between iCloud and Outlook. Follow these steps to turn on the Add-in:

In Outlook 2010 and later:

1. Select the File menu.
2. Click Options in the left panel.
3. Click Add-ins in the left panel of the Outlook Options window.
4. Look at the list of add-ins in the Active Application Add-ins section.
5. Select the iCloud Outlook Add-in.

In Outlook 2007:

1. From the Tools menu, select Trust Center.
2. Select Add-ins from the left column.
3. Look at the list of add-ins in the Active Application Add-Ins section.
4. Select the iCloud Outlook Add-in.

Make sure that iCloud isn’t your default account in Data Files

When iCloud is set as your default account in Data Files, your data won't sync between your devices. 

Outlook 2010 and later:

1. Select File > Info > Account Settings > Data Files. 
2. If iCloud is listed as the default account in the Comments column, select a different account.
3. Click Set as Default.

Outlook 2007:

1. Select File > Data File Management > Data Files. 
2. If iCloud is listed as the default account in the Comments column, select a different account.
3. Click Set as Default.

Restart your computer

Turn your computer off and back on.

Thanks for reaching out to Apple Support Communities.

Kind Regards.