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I have three mailboxes on thunderbird and one refuses to open recently says not allowing username or passwword all other mailboxes are working one of the one th

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I have several mail folders on Thunderbird Suddenly my main Bigpond (Aust) account will not recognize the username or password but other Bigpond addresses are fine. I am concerned to change anything without advice.

I have several mail folders on Thunderbird Suddenly my main Bigpond (Aust) account will not recognize the username or password but other Bigpond addresses are fine. I am concerned to change anything without advice.

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they have been migrating to a new platform since last September. See https://thunderbirdtweaks.blogspot.com.au/2016/09/bigpond-mail-changes.html