Why is the View Sample Inventory Orders link Missing From the My Samples Tab in CRM Online?
The Inventory Order tab is not available for the user. Create a Tab for Inventory Orders.
Set the Custom Tab Settings for the Profile to either Default On or Default Off (Tab Hidden does not have the link displayed).
Check to be sure the user did not remove the tab from Customize My Tabs of the All Tabs page (+ Tab on the SFDC Tab bar).