The got the current wording from Bug 716412 - compact dialog prompt: unchecking "Always ask me before compacting folders automatically" fails to change or keep mail.purge.ask preference to false. Please read that bug if you plan to comment here. The current wording is The messages you have deleted can be purged from disk. This operation will save about 208 MB of disk space. Select the option below to let Thunderbird do this automatically without asking you. <Checkbox>: Remove message deletions automatically and do not ask me“ It is proposed to not use the word "purge", perhaps use terminology that suggests "maintenance", perhaps mention that trash folder will not be touched, etc. Here is one idea, which shamelessly borrows and stitches in wording from others Thunderbird needs to do some cleaning, which will save about XXXX MB of disk space. This normal maintenance does not remove messages from Trash or other folders. If you check the box below before you proceed, Thunderbird will do this automatically in the future and not bother you again. I know some suggestions have included the word "deletions" - I suggest we don't. It would also be nice if we could point users to https://support.mozilla.org/en-US/kb/compacting-folders
Bug 1678856 Comment 49 Edit History
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We got the current wording from Bug 716412 - compact dialog prompt: unchecking "Always ask me before compacting folders automatically" fails to change or keep mail.purge.ask preference to false. Please read that bug if you plan to comment here. The current wording is The messages you have deleted can be purged from disk. This operation will save about XXX MB of disk space. Select the option below to let Thunderbird do this automatically without asking you. <Checkbox>: Remove message deletions automatically and do not ask me“ It is proposed to not use the word "purge", perhaps use terminology that suggests "maintenance", perhaps mention that trash folder will not be touched, etc. Here is one idea, which shamelessly borrows and stitches in wording from others Thunderbird needs to do some cleaning, which will save about XXXX MB of disk space. This normal maintenance does not remove messages from Trash or other folders. If you check the box below before you proceed, Thunderbird will do this automatically in the future and not bother you again. I know some suggestions have included the word "deletions" - I suggest we don't. It would also be nice if we could point users to https://support.mozilla.org/en-US/kb/compacting-folders