There was some great talk about Skype -> Teams interoperability / coexistence modes in Microsoft’s Tech Community. I noticed I was also had to start to rethink about the coexistence and how Teams-Skype interop really work now – especially when you have some of users in TeamsOnly mode.
Earlier Islands + some users in TeamsOnly worked the way I described earlier. Then interoperability changed when this TechCommunity blog article was released in October.
From that blog note the picture
What is clear, is that when you are in Islands mode: send message from Teams and it always ends up in Teams. And when you message from Skype it always ends in Skype. Simple, until you have a people in TeamsOnly mode.
Islands + TeamsOnly does change that a bit: when somebody from Skype sends TeamsOnly account a message it ends up in Teams as it should be.If you reply it will continue on the same messaging channel (Skype-Teams). But when the chat is over and TeamsOnly person sends a message to Skype user, it either ends up in his Teams (if he has one active) or Office 365 sends him email that he should install Teams.
Earlier you could have two messaging instances easily (Teams-Skype,Teams-Teams) with a single person – now it is more rare.
In order to make the coexistence work so that Skype-users can go on using only Skype and Teams users can use only Teams, then you should change interoperatibility modes so that Non-Teams users are SkypeOnly and Teams users are TeamsOnly.
Concerning migration commands: TeamsInteropPolicy is no longer used and should not be used.
Make sure to check on latest documentation regularly on Docs.Microsoft.Com when you are migrating Skype to Teams
Documentation gets lots of updates all the time, so make sure you check it before starting the migration and when you are in actual migration: check the important parts at least monthly and pay attention to new blog posts. Interoperability gateway v2 is going to emerge at some day, which will again potentially change how these tools work together.
For example Coexistence modes has a tons of information about this And when you bring in federated messaging, there are great tables like this about that.
What does this mean? With federated messages and calls: if you are in TeamsOnly you will get all your messages into Teams, otherwise all end up in Skype for Business. The simplest case is TeamsOnly<->TeamsOnly of course.
If you have OnPremise Skype for Business and Hybrid environment – plan & test your migration well to uncover all possible hickups.
TeamsOnly + Outlook Online Calendar Meeting
Have you noticed, that if your organization is using Teams you can now create Teams meetings from Outlook Online Calendar? See – no more Skype in there! (If Teams has not been enabled, there is a option to create Skype-meeting instead)
Outlook mobile does not have Teams meeting option available yet. But it should arrive soon. On mobile it is of course best to create a Teams meeting with Teams app. On Teams mobile you can’t add attendees outside your own organization at the moment.