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Keyboard shortcuts on Windows 10 Pro

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I think the keyboard shortcuts don't work on Windows (10 Pro). I was looking for a shortcut to mark an email as read/unread. Initially I select the email in question. According to the documentation it should be Ctrl+M but this has no effect. According to the context-sensitive dropdown list it should be Ctrl+k, Ctrl+R to mark as READ and Ctrl-k, Ctrl-U to mark as UNREAD. Either the documentation or the underlined context-sensitive letters are incorrect. However neither work. Have I overlooked something important? Firefox and Thunderbird are latest versions.

Kind Regards from a programmer that began with Assembler and ended with Python, Andrew Bauer

I think the keyboard shortcuts don't work on Windows (10 Pro). I was looking for a shortcut to mark an email as read/unread. Initially I select the email in question. According to the documentation it should be Ctrl+M but this has no effect. According to the context-sensitive dropdown list it should be Ctrl+k, Ctrl+R to mark as READ and Ctrl-k, Ctrl-U to mark as UNREAD. Either the documentation or the underlined context-sensitive letters are incorrect. However neither work. Have I overlooked something important? Firefox and Thunderbird are latest versions. Kind Regards from a programmer that began with Assembler and ended with Python, Andrew Bauer
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Select email right click to see drop down or use the 'drop down' key on keyboard, press 'K' key to get 'Mark', press 'U' key to set as Unread or press 'R' key to mark as Read

Or Select email 'Alt'+ 'M' selects 'Message' on top 'Menu Bar' press 'K' key to get 'Mark', press 'U' key to mark as Unread or press 'R' key to mark as Read

More info: https://support.mozilla.org/en-US/kb/keyboard-shortcuts-thunderbird#w_message-functions

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Select email If you select Ctrl+U this opens the source view. You see this under 'View' > Message Source = Ctrl+U