Brian,
Right now there is no support for Office 365 (or Office 2016). You can see the current support matrix here for Windchill 10.2 M030 (see page 24):
http://support.ptc.com/WCMS/files/156056/en/Windchill10.2M030SoftwareMatrices52015.pdf
The Windchill Future Platform Support document currently says that the next major release of Windchill (either 10.3 or 11.0 depending on who you ask) will still only support up through Office 2013.
According to CS130307, support will never be added for Office 365.