Windows 10 will reach EOS (end of support) on October 14, 2025. For more information, see this article.

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Unable to write the email to the mailbox. Make sure the file system allows you write privileges, and you have enough disk space to copy the mailbox.

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Thunderbird would not download emails, send emails, or save drafts. After having this problem several times, I found the fix! Navigate to C:/Users/YOUR_USER_NAME/AppData/Local/Temp You will be notified that you don't have permission. Click "Continue" to gain permission. VOILA, it works! (I also could not see jpegs, and Dropbox would not load.)

Thunderbird would not download emails, send emails, or save drafts. After having this problem several times, I found the fix! Navigate to C:/Users/YOUR_USER_NAME/AppData/Local/Temp You will be notified that you don't have permission. Click "Continue" to gain permission. VOILA, it works! (I also could not see jpegs, and Dropbox would not load.)

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Thanks for the try, but it didn't work for me.

I have several websites with their own emails. Weirdly, some allow me direct pop3 set up of accounts in TB. but other don't. I keep getting this error message on two of them.

Unable to write the email to the mailbox. Make sure the file system allows you write privileges, and you have enough disk space to copy the mailbox.

I've gone from my site servers to TB and these forums without any solutions.