You will normally see this error message:
Unable to create MailManager object: mailmng failed: Run-Time error: LoadLibrary(C:\Program Files\SWsoft\Plesk\admin\bin\mailenable\providerw.dll) failed
if MailEnable is not installed. If you would like to install MailEnable (which is included with Plesk), follow these instructions:
1. Start -> “Settings” -> “Control Panel” -> “Add or Remove Programs”
2. Select “Plesk 7.5.3 for Microsoft Windows” and hit “Change”.
3. Select “Modify” -> “Next” and then click the plus sing to expand the group “Mail Management”
4. Click the icons next to each item, and select “Entire component will be installed on local hard drive” for the items that you would like installed.
5. Click “Next” and then “Next” again and the installation will start.