Many users would like to set the iCloud data file as their default data file, if only because they want to see their appointments on the To-do Bar. It doesn't work with all Outlook versions, all account types, or all iCloud versions. It is not recommended, but generally speaking, if it works on your system and does not crash Outlook, you can try it.
When iCloud is set as default and you use an IMAP account, you can't send email in older versions of Outlook. This is because IMAP accounts need a default data file for sent items, even if you have Outlook configured to move sent items to the IMAP folder. The iCloud does not support a Sent Items or other mail folders. (Outlook 2013 and up do not have this problem.)
When the iCloud folder is set as default data file, you can only create Notes (or Journal entries) when you are viewing a (non-IMAP) pst file. If you use RSS feeds, you need to select a delivery folder in local pst file when you add the feed to the profile.
There are no workarounds for IMAP accounts in older versions of Outlook. You'll need to use a POP3 account to send email. There may be other errors and issues I'm not aware of.
General Outlook and iCloud issues are at Outlook and iCloud Sync Issues. iCloud & Outlook Calendar issues are at iCloud and Outlook Calendar Sync Issues and Contact issues are at iCloud and Outlook Contact Sync Issues
"Cannot Start Outlook..." Error
If you receive this (or a similar) error message
Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened. Unsupported folder class (IPF.Contact)
You don't have the default delivery location set to a pst.
To change the default data file to a local pst file, open Control panel and find Mail, open the profile, Account Settings, then select Change Folder at the bottom of the dialog or set the PST file to default on the Data Files tab.
"Do not have permission to create entry..." error
When an IMAP account is set as the default email account and iCloud is set as the default data file, you'll receive this error message when you attempt to create a new message:
You don't have permission to create and entry in this folder. Right-click the folder, and then click Properties to check your permissions for the folder. See the folder owner or your administrator to change your permissions.
You'll receive a similar message when you try to create a new Note (or Journal item).
Before creating the note, you need to select a folder in a non-IMAP pst file before trying to create the item.
"Service provider does not support operation..." error
When you try to compose a message while viewing the IMAP folders or send reply to a message received on an IMAP account, you'll receive the following error. The default service provider (the icloud data file) does not support mail items.
Could not complete the operation because the service provider does not support it.
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