Troubleshooting scenario 3: The Send To function is disabled even after MAPI is installed

Symptom
The 'Send To' function in the client is disabled, even after you install MAPI.
Possible causes
Your Windows Messaging Subsystem registry key is set to 0 (zero).
Action
Ensure that the following registry key is not set to 0 (zero): HKEY_LOCAL_MACHINE\Software\Microsoft\Windows Messaging Subsystem