Bugzilla

"On Thunderbird I keep seeing a message that asks me to purge deleted messages.  Does this mean that if I check this I will lose all messages in Trash, which I do not want to do.  If yes how can I stop the purging message?"
https://support.mozilla.org/en-US/questions/1317606

"'How do I stop Thunderbird from proposing to purge trash automatically every time I delete an email"
https://support.mozilla.org/en-US/questions/1317607

"On Thunderbird I keep seeing a message that asks me to purge deleted messages.  Does this mean that if I check this I will lose all messages in Trash, which I do not want to do.  If yes how can I stop the purging message?"
https://support.mozilla.org/en-US/questions/1317606

"'How do I stop Thunderbird from proposing to purge trash automatically every time I delete an email"
https://support.mozilla.org/en-US/questions/1317607

As you can see from these comments, people do not assume this has anything to do with compacting.  They often have little or no knowledge about the need to compact files to tidy them up, and even those who do and who compact on a regular basis, still get that message and are confused. They see the pop up as a message to purge/empty their Trash folder which they do not want.