Hello,
Some time ago it was found that Office 365/Excel 2013 (the downloaded version running off the PC as well as the online versions) didn't interact with my Firm's stock trading software via DDE links as other versions of Excel do/did. To-date the only workaround we've been able to figure out is to run both versions of Excel on the machine/PC, running the stock data to spreadsheets via Excel 2010, whilst running all other Excel needs through Excel 2013/Office 365. I was told at the time by Microsoft though (around 12 months ago now) that this was something Microsoft were investigating and working on.
Is this something that will be available soon by any chance as it's a major inconvenience given the work we do not to be able to use the latest technologies, and from our investigations into various financial trading systems the majority of powerful and professional ones use DDE links for data.