A. Typically, a Global Catalog (GC) server evaluates a query-based DG every time the DG is used as a target for an email message. If you have query-based DGs that produce large result sets, you can perform these steps to set an explicit server to expand the group every time:
- Right-click the query-based DG and select Properties.
- Select the Exchange Advanced tab.
- Under Expansion Server, change the default "Any server in the organization" to a specific server in the drop-down list.
- Click OK.