Assume that you move an archive mailbox from on-premises to Microsoft Exchange Online, and the mailbox is added as a Favorite shortcut. After this migration is complete, you cannot access the archive mailbox, and the shortcut for the archive mailbox folder is not displayed in the Favorites list in Microsoft Outlook Web App. Additionally, you receive the following error message:
The item you tried to access no longer exists. The item wasn't found. You or a delegate might have moved or deleted it using another computer or a mobile phone.
This issue occurs because of a by design logic in the Microsoft Exchange Server 2010 environment.
To resolve this issue, install Update Rollup 10 for Exchange Server 2010 Service Pack 3.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.