The error message "Alfresco is running without Share Services" specifically indicates that the Alfresco Share user interface is unable to find and connect to essential services that it expects to be available from the repository. These services, which include functionalities for site management, user invitations, and other collaborative features, are packaged within the alfresco-share-services.amp (Alfresco Module Package). This AMP is a repository-side extension and must be applied to the alfresco.war file. Applying this module to the repository and restarting the service makes the required APIs available to Share, resolving the error.

A. The Share Services AMP is a repository extension; applying it to the Share web application (share.war) is incorrect and will not resolve the issue.

C. Re-deploying the share.war file will not fix the problem, as the issue lies with missing components in the repository, not the Share application itself.

D. While using matching versions is a prerequisite for a stable system, it does not automatically install the optional Share Services AMP, which is the specific cause of this error.

1. Alfresco Content Services 7.0 Documentation, Installing Share Services: "The Share Services AMP (alfresco-share-services.amp) is required for Alfresco Share to run correctly. It is applied to the Alfresco Repository WAR (alfresco.war)." This section explicitly states the purpose of the AMP and where it must be installed.

Source: Alfresco Documentation, https://docs.alfresco.com/content-services/latest/install/zip/amp#install-share-services-amp (This link points to the latest version, but the principle is consistent across ACS versions).

2. Alfresco Content Services 6.2 Documentation, Installing an Alfresco Module Package (AMP): This guide details the standard procedure for applying AMP files to Alfresco WAR files using the Module Management Tool (MMT). The process involves placing the AMP in the amps directory and running the applyamps script, which targets the alfresco.war by default. This confirms the technical procedure implied in the correct answer.

Source: Alfresco Documentation, https://docs.alfresco.com/content-services/6.2/install/zip/amp/ (Section: "Install an Alfresco Module Package").