1.In Outlook, there is no direct command line to open a particular calendar item. The following article summarizes some command-line operations for your reference:https://www.slipstick.com/outlook/how-to-use-outlooks-command-line-switches/.
2.The values to use in the /select switch are the names of the Outlook folders that you want to open. For example, if you want to open the Inbox folder, you can use the following command: outlook /select outlook:inbox
If you want to open a subfolder or a custom folder, you can use the full folder path separated by slashes. For example, if you want to open a folder named Projects under the Inbox folder, you can use the following command: outlook /select outlook:inbox/projects
You can also use the folder ID instead of the folder name, if you know it. The folder ID is a unique identifier for each folder in Outlook. You can find the folder ID by using the [MFCMAPI tool] or by using PowerShell. For example, if you want to open the Calendar folder using its ID, you can use the following command:
outlook /select outlook:{ID}