Welcome to the Alfresco One 4.2 documentation.
If you want to know about the new features and improvements in this Alfresco release, see What's new in Alfresco.
If you're looking for an older service pack, we have PDF versions of the documentation on the Alfresco Support Portal.
Alfresco customers should also take a look at the Alfresco Support Handbook.
For help with Alfresco Community, go to the Alfresco Community Edition 5.1 site.