The current version of Xbar handles all aspects of integration with Outlook, except for merge templates. Older Outlook integration products handled things differently.
If you are using Infor CRM 8.4.x, Xbar 1.4.0 is likely the best version to use. If you are using Infor CRM 8.3.x, Xbar 1.3.9 is the best version to use.
The administrator can enable sync in the Integration section of the Infor CRM web client.
Here are two more drastic option to reinstall or repair Xbar, which clear out data that is not touched by other methods.