I organized my contacts into folders like (friends), (relatives), etc with up to 50 or more names per folder.
I wanted to address an email to all the recipients in a folder. I clicked on (Tools) and (windows contacts) and selected the (friends) folder. I highlight the recipients in this folder and then
clicked on the (email) button on the toolbar.

If I highlight less than 24 recipients, all is well. I can compose my email and send it with no problem.
However, if I highlight more than 23 recipients and then click on the (email) button, nothing happens.
I can't compose the email and I can't send it.