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Outlook | Windows | New Outlook for Windows | For home
Using New Outlook on Windows for personal email, calendar, and contact management
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Hi. I'm Brian and I'll try to help.
Before you made the change, what type of account were you using - IMAP, POP or Exchange? Where you using classic or new Outlook. After the change, which Outlook are you using? The reason I ask is that for some account types and mail services, the calendar doesn't sync to the server and so when you change the client program, you lose the non-synching folders like Calendar.