In a Microsoft Exchange Server 2016 environment, you may find two SyncDelivery logging folders that are created incorrectly under C:\Mailbox\SyncDelivery\Error and C:\Mailbox\SyncDelivery\Request. Additionally, logging files are written into these folders.
Typically, the folder paths should be created in the following locations:
C:\Program Files\Microsoft\Exchange Server\v15\TransportRoles\Logs\Mailbox\SyncDelivery\Error
C:\Program Files\Microsoft\Exchange Server\v15\TransportRoles\Logs\Mailbox\SyncDelivery\Request
This issue occurs because log path calculations are not handled correctly.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.