Windows 10 mail

I'm trying to be positive about changing to a new computer and getting everything set up the way I want it.  I was using Windows Live Mail to mange my Comcast mail account and really loved it.  I'm willing to give the new Mail a chance so I've tried setting it up by setting up my Microsoft account and following the directions.  My contacts actually showed up in People but when I try to send mail the screen says "still not synced".  Also, should I be able to see a place for folders, sent items, etc. ?  Those things are nowhere to be found.  Will they show up when the mail finally syncs and why isn't it syncing?  I read all the help menus and can find nothing else to do to get everything started.  If I install Windows Live Essentials 2012, will it work with Windows 10?  I've also noted that there is no option for forming groups in Windows Mail.  This is a deal breaker for me as I manage the email distribution list for my subdivision which I have divided into 4 groups of 100 contacts each.  How can I do this in Windows Mail?  If there is no way then this Mail app is useless for me.