The view you have selected contains more than 5000 items and exceeds the maximum amount of items SharePoint allows you to view at once - this is also known as the list view threshold.
To view items try selecting another view or creating a new view. You can select other views in MacroView DMF and MacroView Message by:
In MacroView DMF and Message 8.5. and later
- Click the View Selector on the File List Toolbar
In MacroView DMF and Message 8.4 and earlier
- Outlook: Click the Home ribbon > Find the MacroView group > Click the View dropdown menu
- DMF Explorer: Click the View ribbon > Find the Views group
If you do not have sufficient permissions to create views for this list, ask your administrator to modify the view so that it conforms to the list view threshold.
Modified File List warning
When the selected view triggers the List View Threshold in MacroView DMF and Message 8.6.19 and later, the file list is modified to use available indexed columns so that results can be displayed. When this occurs a "This View has been modified to accommodate the List View Threshold so that files can be shown." warning message is displayed to indicate that the file list has been modified or limited due to this condition.
To learn more, visit Manage large lists and libraries in SharePoint on the Microsoft support site.