EM Client not receiving all messages

I am receiving messages on AOL and Microsoft Mail but when I look at messages on EM, some are not there. Does not happen all of the time and it is not always the same sender. A bit scary

Thoughts?

Did you search for the messages? Before you do that, click the down-arrow in the search box and select all folders and the option with the most fields. You can untick the server search option.