The Outlook team has recently been made aware of a serious bug / flaw with the recently announced Google Apps Sync for Microsoft Outlook, and as a result we wanted to provide the Outlook user community with additional details around this problem as well as information on how to address it.
The installation of the Google Apps Sync plugin disables Outlook’s ability to search any and all of your Outlook data.
To lean more read the complete article.
Source : Microsoft Office Outlook Team Blog