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[Windows 10]

I have been using Windows Live Mail-2012 with Windows 10 with no problems until now.  Everything works fine but one. and that is I cannot send mail any longer.  Still receive mail just as in the past.  Do I need to reinstall Windows Live Mail 2012?  I initially tried to install Outlook Mail with Windows 10 but had a lot of difficulty transferring Contacts, Inbox Mail, and Sent Mail.  Also have found in Windows 10 that my Inbox deletes older messages that I want to save.  Why does this happen - is there some setting that I am missing?