You should see: "DllRegisterServer in mscal.ocx succeeded."

On modern 64-bit Windows systems running 32-bit legacy software, the control should be placed in the SysWOW64 folder:

You should see a message saying "DllRegisterServer in mscal.ocx succeeded." The Better Alternative: Upgrade Your App

The file is present but hasn't been properly registered in the Windows Registry. How to Get and Install MSCAL.OCX Version 7.0

Ask a colleague who still has an old Office 2007/2010 installer or use a virtual machine with licensed legacy software to extract it yourself.

If your application still fails, consider installing the and set Compatibility Mode to Windows XP (Service Pack 3) for the calling executable. This does not replace the OCX but helps resolve older dependency loading issues.

C:\Program Files\Microsoft Office\Office12 (for Office 2007) C:\Windows\System32 (on older 32-bit systems) 2. Move to the Correct Directory