1. On the computer select Start|Control Panel.
2. Click Programs.
3. Click Programs and Features|Turn Windows features on or off.
4. The checkbox for Internet Information Services is totally unchecked.
When running the Mail Security for Microsoft Exchange (MSMSE) installer the following error message is shown:
Microsoft Internet Information Services is required for installing Symantec Mail Security for Microsoft Exchange.
The install does not complete.
The installer is erroneously checking that IIS is installed.
1. Install IIS. See the following article for details: What IIS Settings are Required to Install and Run Symantec Mail Security for Exchange?
2. Install SMSMSE.
3. Uninstall IIS.