We’re seeing a number of people report receiving Error 4202 when they sync Outlook 2010 with the Hotmail server. This error happens when Outlook syncs email addresses in the blocked sender and safe sender with Hotmail and one or more addresses contain an underscore or is malformed. It shouldn’t prevent a person from sending or receiving messages, as synchronization of mail, calendar, contacts and other data (including the junk lists) continues.
The short term fix is to delete the suspect addresses from the Safe and Blocked Senders lists in Outlook.
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I have tried to delete all of my safe senders and blocked senders, but there are two single word entries that will not go away. I have selected them and removed multiple times, but when I refresh the page, they return to the list of safe senders.
What are the words? Did you try deleting them from the account online?