Is there any out of the box dashlets in Alfresco which is equivalent to Announcements list in SharePoint? Basically, to show some announcements to the Site users? Can we use any of the datalists?
Some people use the out-of-the-box wiki page dashlet for that. Or, if that doesn't meet your needs, you can use the Notice Dashlet for that, which is available from the Share Extras project.
