Cannot delete this folder. Right-click the folder, and then click Properties to check your permissions for this folder. See the folder owner or your administrator to change your permissions. Outlook is synchronizing local changes made to items in this folder. You cannot remove this folder until the synchronization with the server is complete.
When attempting to delete this folder using MFCMAPI using a hard delete or soft delete, the following error was experienced:
Function IpParentFolder->DeleteFolder(IpItemEID->cb, (LPENTRYID) (IpItemEID->lpb, lpProgress ? (ULONG_PTR)m_hWnd : NULL, lpProgress, ulFlags)
The folder also could not be removed using Outlook Web App.
To remove the corrupt folder, the New-MailboxRepairRequest was executed against the accounts mailbox with the corruption types set as ProvisionedFolder, SearchFolder, AggregateCounts and FolderView.
New-MailboxRepairRequest -Mailbox accounts -CorruptionType ProvisionedFolder,SearchFolder,AggregateCounts,Folderview
As this Exchange Server is running Exchange 2010, the Get-MailboxRepairRequest command does not exist. This command was introduced in Exchange 2013 for viewing the status of a mailbox repair task. However in Exchange 2010 we can still view the repair request using Windows Event Viewer.
We can see here the mailbox repair request started with the corruption types specified above.
The next event log shows the repair completing successfully.