OpusFlow contact information

Exchange GroupCalendar is a product by OpusFlow
OpusFlow is an Independent Software Vendor and developer of collaborative tools and add-ons for Outlook and Exchange server, founded in 1999.

We can be reached by regular telephone both at European as US business hours. Our U.S. number is
(315) 849-2560

To reach us on our European number when calling from the US you will have to dial the following number:
Your exit code (probably 011) + 31.186.669.194 so that's

When you are calling from Europe simply dial


You can also reach us by email at: info@opusflow.nl  we strive to answer your questions within one hour.


"Thanks again for such a quick response. My previous experience has been that I would consider myself lucky if I got a response within the same day."