Outlook calendar and contacts do not sync to iCloud
If you are trying to sync iCloud calendars and contacts to Outlook and it fails, you may see an unexpected error such as 0x800706ba.
The issue is usually with the iCloud for Windows integration, the iCloud Outlook add in, or the way Outlook is handling its default data file.
Password changes can trigger it, but the underlying cause is often a broken connection between iCloud and Outlook rather than the password itself.
Before you change anything
These checks help you avoid doing the same step repeatedly with the same outcome.
Confirm you can sign in successfully at icloud.com
Confirm the Windows date and time are correct
Close Outlook completely and check Task Manager to confirm Outlook is not still running
Restart the computer once before deeper changes, especially after a password change
Step by step fixes to try first
1. Confirm required Windows services are running
Open Services on Windows and confirm these services are running. They are normally set to Automatic.
Remote Procedure Call (RPC)
DCOM Server Process Launcher
RPC Endpoint Mapper
If any are stopped, start them, then restart the computer and test iCloud sync again.
2. Repair iCloud for Windows
If you are using iCloud for Windows, try repairing it before uninstalling.
Open Windows Settings
Go to Apps
Find iCloud
Choose Advanced options
Select Repair
Restart the computer, then test again
3. Sign out and reconnect iCloud in the right order
This resets the integration link and often clears the stuck state.
Open iCloud for Windows and sign out completely
Restart the computer
Sign in again
Before enabling Mail, Contacts, Calendars, open Outlook once, then close Outlook
Now enable Mail, Contacts, Calendars and apply the change
Restart Outlook and check whether calendar and contacts sync correctly
4. Check the iCloud Outlook add in
In Outlook, open Options, then Add ins.
At the bottom, choose Manage COM Add ins, then Go.
Confirm the iCloud Outlook Add in is enabled.
Also check Disabled Items and re enable it if it has been disabled.
The fix that often resolves stubborn cases
If the iCloud integration keeps switching Contacts and Calendars back off, or the error continues after the steps above, a common cause is Outlook not using a compatible default data file setup.
Create a new empty PST file and set it as default
This is a common workaround that resolves the Outlook and iCloud handshake in some environments.
In Outlook, create a new empty PST data file
Set the new PST as the default data file
Close and reopen Outlook to confirm the new PST is the default
Then re run the iCloud for Windows Outlook setup so it can attach calendars and contacts correctly
This does not automatically delete your mail. It changes what Outlook treats as the default data file for certain operations.
If you are unsure, stop and request help, because Outlook profiles and mailboxes vary.
What not to do
These actions often waste time and can make recovery harder.
Do not repeatedly change passwords hoping the error will clear itself
Do not uninstall Office unless you have a clear reason, reinstalling Outlook is rarely the real fix
Do not delete Outlook profiles or data files without confirming what they contain
Do not remove iCloud data folders if you are not sure whether Outlook still depends on them
When assessment is required
If the issue is affecting a business mailbox, or if Outlook profiles are complex, you may need an assessment rather than trial and error. This is especially true when there are multiple accounts, shared mailboxes, add ins, or unusual data file configurations.
The error persists after repair, sign out and add in checks
You are not sure which data files are safe to change
Calendar and contacts sync works on one computer but not another
Outlook is connected to Microsoft 365 but uses multiple profiles or legacy PST archives
Next steps
If you want, we can review the Outlook profile setup, confirm the default data file behaviour, and restore reliable sync without guesswork. We will explain what we are changing and why.