Export to dynamic worksheet from CRM2013 online

Hi,

I tried to export to dynamic worksheet, it comes to XML file. I opened the file in excel, I got security warning of Data connections have been disabled, enable content.  I enabled content, then I got this error message. 

We are using CRM 2013 online version without installing CRM for outlook because we are using Lotus note. Is there any way  can make dynamic worksheet work?

Thanks

Carys