Hello Thiery,
Could you please share more information on this like:
> What is the Outlook interface version on local machines of users using Office 365 in your company? Outlook 2007/2010/2013?
> Does the integration with C4C works seamlessly without any issues? Like Outlook giving sync error or Outlook hanging/freezing due to the C4C - Outlook add-on installed?
> Also, will appreciate if you could share a screen shot containing information from your machine's control panel - Programs & Features showing what are the pre-requisites and their versions which are being installed for the Outlook Add-on like .Net Framework & its version, Assembly, etc.?
Will appreciate inputs from you as you mentioned that with Office 365, the Outlook Add-on of C4C works fine for you.
Many thanks for your inputs in advance!
BR
Ankur