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Errror Message on trying to open Thunderbird - Windows 11

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Thunderbird fails to opn properly and I get message "Unable to open folder mailbox ... because it is in use by another process. Please wait..." Waiting never ends. It is trying to load my default in box. If I try clicking on the Loading message £I get Thunderbird is not respondinng ,,..."

Thunderbird fails to opn properly and I get message "Unable to open folder mailbox ... because it is in use by another process. Please wait..." Waiting never ends. It is trying to load my default in box. If I try clicking on the Loading message £I get Thunderbird is not respondinng ,,..."

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