Outlook Add-in command button disabled when composing

3
votes

My add-in has a MessageComposeCommandSurface ExtensionPoint that adds a button to the ribbon when the user is composing a message. I expected the button to always be enabled when it is visible (e.g. when the user is composing a new message or replying to an existing one), but sometimes it is greyed out/disabled and I'm not sure why.

Does anyone know the exact circumstances for when an add-in ribbon button is greyed out/disabled?

1
office-jsoutlook-web-addins
They can be grayed out if the message is DRM enable, SMIME signed or encrypted. (note that support for SMIME signed messages in Outlook 2016 C2R versions, is expected in a future version). If this is not your case, sending a screenshot of the window, and your manifest may help us debug. - Outlook Add-ins Team - MSFT
Thanks! I'm still gathering information from the users who are experiencing this, but is it possible that having a different add-in installed could affect whether my add-in is disabled? Or is it only the above things that you mentioned that can affect it? - Daniel Phan
Installing another web addin, should not be able to disable another one. However, some COM add-ins that use custom forms are incompatible with Web Add-ins. If you click the add-in button in the Explorer (reading pane) view, it should tell you so. - Outlook Add-ins Team - MSFT
Some of the other scenarios that could disable add-ins are: If the item is in Outbox, Drafts, or Sync Issues. (+ Junk Mail for compose), Or if the item is embedded. (a .msg file or an attachment on another message). - Outlook Add-ins Team - MSFT
Thanks! Seems like it is a COM add-in (en.todoist.com/outlook) that is causing our web add-in to be disabled when composing an email. - Daniel Phan

1 Answers

0
votes

Try to disable some COM add-in and then enable it again. In my case it helped to make buttons active.