I developed an application in VBA for office 2003. I tested and sent it to a client. Works fine on my machine but compiling or running it on their machine give the error "Cannot Find Library". It then highlights the function LCase$. I tried using LCase$ in the immediate window and it gives me the same error. I open the object browser (F2) and browse VBA. The String library shows as does LCase$ and LCase. I tried using a number of the functions in the string library (Left$, Right$, Mid$, etc.) and they all give me the same error. The client had installed Office 2007 so we moved over to another machine that had 2003. Same problem. Other functions and statements execute but none of the string functions. I've never seen the likes. Any ideas?