My company uses the Salesforce.com Lightning for Outlook web add-in. The add-in is properly installed and configured on our Exchange server. The add-in is checked "on" in my server profile and appears in the Outlook ribbon and works fine -- on OWA and in OL16 on two of my three machines. On #3, it used to appear in the ribbon and now it doesn't. I have another user where it likewise disappeared from OL16. Created a new OL16 profile fro myself on a different machine, add-in works fine there too. So, it's not a problem with the add-in itself, the server configuration, or user permissions. All Office 2016 and Windows 10 v1809 updates are current. Is there a way to tell OL16 to re-enable the web add-ins or force a re-load, or am I stuck blowing away my profile and starting over?