Lost content when emails with attachments moved to local mailbox.

Well, I found a suggestion elsewhere on this website and apparently it works. I used Go to open the folder /Library/Mail/V9, then made protection copies of all files containing the name "Envelope Index", then put those on the desktop as a temporary back up, then trashed all the files named Envelope Index. When I closed and reopened Mail it reindexed all my files and this has apparently solved the problem. I can now move email messages to my mailboxes without the content I wish the nice people at Apple Help had known this so I could have solved this a couple of months ago.

Well, that worked on the first dozen or so emails that I moved to my mailboxes, then when I moved a batch, it quit and all the content disappeared. The bug is still there. Apple, a fix would be greatly appreciated.

Sadly the fix I described above of trashing the Envelope Indexes in the folder /Library/Mail/V9 and letting

Mail re-index itself when it reopened only worked for a few days.

Now I'm again losing all the content except the subject line in emails moved from the Exchange inbox to other mailboxes.

Help!

Last week I called Apple Support and the advisor looked up my August case number and said there apparently hasn't been a fix for lost email content when the email with an attachment is moved from Exchange inbox to a self-created mailbox.

We agreed that I should try upgrading to Ventura. The fix might be in the new OS version. This morning I upgraded and, sadly, all content still disappears when I move an email that has an attachment from my Exchange inbox to a self-created mailbox. HELP!! PLEASE!!

After waiting a quite a while, 5 to15 minutes in some cases, the contents that have disappeared reappear. The reindexing looks like it is working. Thank you for your suggestion KiltedTim. Exchange came from GoDaddy when they dropped POP email. I did talk with them but they had no ideas. It looks like the deletion of the Envelope Indexes is a real fix!

I just tried trashing the envelope files in /Library/Mail/V10 and it worked for nearly an hour before the content started disappearing again.