re : After updating windows, I noticed that several programs such as Norton, and Thunderbird were removed. Yes this is what Windows does as those programs were not part of Windows. https://support.microsoft.com/en-us/help/12415 re: All my local folders and calendar are gone. Windows usually creates a 'windows.old' folder which should contain your old profile. https://support.microsoft.com/en-us/help/17125/windows-8-restore-files-old-folder-upgrade It should be here: C:\Users\<Windows user name>\AppData\Roaming\Thunderbird\Profiles\<Profile name>\ The AppData folder is folder is a hidden folder; to show hidden folders, open a Windows Explorer window and choose "Organize → Folder and Search Options → Folder Options → View (tab) → Show hidden files and folders". I presume you installed Thunderbird program. You may have run Thunderbird to auto create a profile, but you have not created any mail accounts as yet because you want to use the old profile. Exit Thunderbird if it is open. Access the 'windows.old' folder and locate the AppData\Roaming\'''Thunderbird''' folder. Copy the 'Thunderbird' folder. Access: C:\Users\<Windows user name>\AppData\'''Roaming''' folder Paste the copied 'Thunderbird' folder into the 'Roaming' folder (if necessary - overwriting the default one created when you recentally installed and run thunderbird). Make sure Thunderbird is an allowed program in your Firewall whcih may be located in your Norton Anti-Virus program. Start Thunderbird.