Very Slow Speed between acrobat dc reader and outlook

HI

I have winedows 7 on my laptop.  We have installed DC Reader.  I can open DC reader and choose email and my email (outlook 2016) open immediately.

We also have a windows 10 server.  With DC Reader, but when I choose email from DC Reader, my outlook take ages before opening.  What could be the solution.  Because we are sending a lot of emails from our server and the speed is driving us nuts.

So there must be something between the server and DC reader that does not work as it should.

Could you please be of assistance.

Regards