Can't get eM Client to bring in mail.

I was using eM Client on an older computer with no problems.  I just loaded on a windows 10 PC and am not able to get it to work.  What should I look for.  Names and passwords for account work ed fine, program loaded all contacts and file folders properly.  It will not load any mail, old or new.  It sends email without problem.

Hello Linda,
could you copy any errors that might appear in the Tools>Operations>Error window when you try to synchronize your mail?
If there are any, please also provide the content of the third tab in the same window titled Log.