For years I have used Windows Live Mail. and used its calendar function.

Today I signed into Outlook (for the first time) from the icon in the Live Mail menu, only because I was looking for a way to print a blank calendar month. When I signed out and went back to Windows Live Mail I found that its calendar was blank and I thought I had lost our calendar and its contents. So I signed back into Outlook and found the complete calendar again. What a relief!

Why were the current calendar items in Live Mail erased? Can the Live Mail calendar be retrieved?

Does this mean that I have no access to a calendar in Live Mail unless I start fresh from today?

If I now use Outlook for the calendar, do I have to sign out each night when I switch the computer off? If I forget to sign out, will I have a problem the next time I switch the computer on.

If Outlook picked up the Live Mail calendar is there any way that Live Mail picks up the calendar in Outlook? 

OP - Calendars in Live Mail/Outlook.com