Error: [Failed to create type 'Exclaimer.Connectors.MailRules.Transport.Factory'] when installing Exclaimer Signature Manger Exchange Edition to a non-default installation path

Relevant Product: Signature Manager Exchange Edition

Scenario

You are installing or upgrading to Exclaimer Signature Manager Exchange Edition. In the installation wizard you change the installation path (default C:\Program Files\Exclaimer Ltd\Signature Manager Exchange Edition) to another folder path or drive letter.

Example:

During installation, the following error is logged:

Installation fails and/or the Microsoft Exchange Transport service is unable to start successfully.

Reason 

This error is displayed when the NETWORK SERVICE account does not have sufficient privileges to the installation directory.

Resolution

To grant the NETWORK SERVICE account permissions to the installation path:

1. Manually create the installation folder path on the server (example: D:\Program Files\Exclaimer Ltd\Signature Manager Exchange Edition).
   
   
2. Right-click on the installation folder and select Properties.
   
   
3. Select the Security tab then click Edit:
   
   
   
   The Permissions window is displayed.
4. Click Add:
   
   
   The Select Users, Computers, Service Accounts, or Groups window is displayed.
   
   
5. In Enter the object names to select, enter NETWORK SERVICE then click OK:
   
   
   
   The Permissions window is again displayed.
   
   
6. From the Group or user names, select the NETWORK SERVICE user.
   
   
7. From Permissions for NETWORK SERVICE, select Full control:
   
   
8. Click OK twice.