I agree, O365 is definitely scheduled for deployment in our environment this calendar year affecting our DTI users. PTC should update the add-ins to allow DTI to work with the full cloud O365
If only PTC was a little more in front of the curve and understood why a company like Microsoft would want to go to Cloud implementations of their software, and move to subscription licensing. If PTC really understood why a company would do such a thing, they would probably be quicker to develop a suite of tools that was compatible with cloud delivered industry standard tools...
It depends on WHERE you use O365. If you have a local installation, there should be no issues with integrating it into Windchill.
The issue comes when your company uses the Microsoft cloud version of O365. Microsft does NOT allow 3rd parties to modify the implemnation and PTC has to modify it for the Windchill DTI plug-in.
This was been discussed in other threads. Here is one I found.