As an admin Check there's a new 'Messaging' category in main Site administration Page. Check  'Messaging' category has, at least, 2 setting pages. 'Message settings' page must have 'Enable messaging system', 'Allow site-wide messaging', 'Use enter to send enabled by default', 'Delete read notifications', 'Delete all notifications' and 'Notification email override' settings. 'Notification settings' page must have options to enable/disable 'Notification plugins' and for each notification plugin is enabled, must have 'Default notification preferences' options for different modules and activities. Access to 'Notification settings'. Click the checkbox next to a disabled notification plugin (e.g. Jabber).  Before saving, check the 'Default notification preferences section (the lower portion of the page), and verify you don't see a column for the plugin you selected in step 4 (I.e. Jabber). Click the 'Save changes' button. Check there is a column for the enabled plugin (i.e. Jabber) in the 'Default notification preferences' section. Go to Site administration. Check under the 'Notification settings' there's a link to the plugin's settings page for each notification plugin enabled in 'Notification settings' page with a 'Settings' link (i.e. Jabber) Check 'Enable messaging system', 'Allow site-wide messaging', 'Use enter to send enabled by default', 'Delete read notifications', 'Delete all notifications' and 'Notification email override' settings are not any longer in 'Advanced features' settings page. Check there's no 'Message outputs' category in Plugins admin page  As an admin, check all messaging settings work as expected: Go to Site administration -> Messaging -> Messaging settings Enable 'Enable messaging system' setting and Save changes. Check 'Toggle messaging drawer' is visible on the left side of the user menu. Disable 'Enable messaging system' setting and Save changes. Check 'Toggle messaging drawer' is not visible on the left side of the user menu. Enable 'Allow site-wide messaging' setting and Save changes. As a non admin user click on 'Toggle messaging drawer' icon and search for a user that is not enrolled in any of your courses. Check you can find them. Disable 'Allow site-wide messaging' setting and Save changes. As a non admin user click on 'Toggle messaging drawer' icon and search for a user that is not enrolled in any of your courses. Check you can't find them. Enable 'Use enter to send enabled by default' and Save changes. Click on 'Toggle messaging drawer' icon and search for a user. Click on one of the results and write a message to it. Check message is sent when you press Enter. Disable 'Use enter to send enabled by default' and Save changes. Click on 'Toggle messaging drawer' icon and search for a user. Click on one of the results and write a message to it. Check message is not sent when you press Enter, and you need to click in 'Send message' icon. Go to Site administration -> Messaging -> Notification settings, disable 'Web' and check 'Toggle notifications menu' is not visible on the left side of the user menu. Go to Site administration -> Messaging -> Notification settings, enable 'Web' and check 'Toggle notifications menu' not visible on the left side of the user menu.