iTunes 5 and the Ordinal 21 Error By jeremy | September 10, 2005 28 Comments Anyone having problems installing iTunes 5.0 and encountering the error message The ordinal 21 could not be located in the dynamic link library MAPI32.dll might try the following. It worked for me: Locate Fixmapi.exe (it’s usually in the C:WindowsSystem32 folder. More details here and here.) Run it (double click on it). Not much visible will happen but next time you load iTunes you should not have any problems.