When I started the program today, I get a message say "eM Client doesn't have a valid license."

License problems
1

I need help fixing this problem.

2

Same thing just happened to be this morning, been using em Client without problem for quite a while.   Following!

3

Me too - wow, this is a biggie - failing on all three systems for which I have a valid paid license - time to look for a new mail client?

4

Dear users,

During the last hour some of you experienced an issue with eM Client licence activation. Your licence was deactivated and it was not possible to re-activate it for some time. The issue was caused by an error in our Licensing system and we worked hard on a quick fix. 

By now you should be able to continue using eM Client. 

We apologize for the inconvenience.

Russel Markosky
eM Client