Hi Memn,
I see that you are having some issues with your iCloud Calendar using Outlook 2011 and iCloud for Windows. I have an article that will help you troubleshoot this issue, and it can be found below:
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.
- Close Outlook.
- Open iCloud for Windows.
- Deselect the Mail, Contacts, Calendars & Tasks checkbox and click Apply.
- Wait a few seconds. Select Mail, Contacts, Calendars & Tasks, and click Apply.
- Open Outlook.
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:
- Select the File menu.
- Click Options in the left panel.
- Click Add-ins in the left panel of the Outlook Options window.
- Look at the list of add-ins in the Active Application Add-ins section.
- Select the iCloud Outlook Add-in.
In Outlook 2007:
- From the Tools menu, select Trust Center.
- Select Add-ins from the left column.
- Look at the list of add-ins in the Active Application Add-Ins section.
- Select the iCloud Outlook Add-in.
When iCloud is set as your default account in Data Files, your data won't sync between your devices.
Outlook 2010 and later:
- Select File > Info > Account Settings > Data Files.
- If iCloud is listed as the default account in the Comments column, select a different account.
- Click Set as Default.
Outlook 2007:
- Select File > Data File Management > Data Files.
- If iCloud is listed as the default account in the Comments column, select a different account.
- Click Set as Default.
Turn your computer off and back on.
Get help using Outlook with iCloud for Windows - Apple Support
https://support.apple.com/en-us/HT204571
Take care, and thanks for visiting the Apple Support Communities.