I have two questions:

1)  I have been having some difficulties trusting that when mailing to a group that all the people receive it.

It used to be that expanding the group in the BCC or To would show all the people in the group.

Recently, I see only see a random three or four people from the group, and don't trust that all in the group will then get the email.

Any ideas what may be happening?

I use the EMAIL CLIENT (not webmail), that I downloaded from Windows Live Essentials.

I see that you are in the process of confusing us with further changes on this forum, but will roll with the changes.

2)  I am unable to copy a list of email addresses from a spreadsheet column and just drop into the To: or BCC when using Hotmail or outlook.com account, either online or with my Windows Live Mail client.

Because of this I had to set up a Gmail account where the feature does work properly. 

What is the proper procedure for inserting a list of email addresses into the "TO" or "CC" or "BCC" without having the manipulate the file?