Hi Matthieu,
As Kid mentioned above, currently, we only support the following:
The Exchange connection for Mac OS 10.6 and Mac OS 10.7
The POP/IMAP connection for Mac OS 10.4 and Mac OS 10.5.
For the Mac OS 10.10.2, the Mac mail app is not supported in our forum now. As a workaround, you can use the Outlook for Mac as Kid suggested above. Your understanding is highly appreciated.
Best Regards,
Neo