The Z-Push-KOE-GAB folder used to transport the GAB data is injected into the folder list only after an KOE enabled OL is detected.
This causes this folder to be synchronized last, meaning that all folders need to be completely synchronized BEFORE the GAB data can be sent to Outlook.
This is not what users expect. They want the GAB data available as soon as possible and don't want to wait for the sync to complete.
This folder should be prioritized (even before the INBOX) and be synched immediately.