Some outdated plugins will no longer work, due to Chrome seeing them as non secure, and choosing to no longer support them.
With the latest update to Chrome, certain types of plugins, known as NPAPI plugins, are longer be available. This may be why some of your plugins are no longer working.
We suggest that you contact the website owners and suggest they change to a more modern, secure technology. Please visit our blog posts for more information: Saying Goodbye to NPAPI, the Final Countdown for NPAPI, NPAPI deprecation: developer guide.
NPAPI plugins include Java and Silverlight. If you want to use Outlook Web Access (OWA) and these other plugins you will have to use a different browser.