PowerTalk deletes email in your In Tray if you delete from your Key Chain the personal gateway software that received said email. Thanks to David Thompson of StarNine Technologies for posting this information on the nets. Every personal gateway is affected, so if you plan on deleting one from your Key Chain, copy its mail to a folder first. Email that came in via routes other than the deleted personal gateway should be fine.
You cannot recover the mail by reinstalling the gateway, but you can recover the deleted messages using a special technique. PowerTalk stores email in a folder called IPM Bin, which lives within your PowerTalk Data folder within your System Folder. If you move all of the remaining email in your In Tray out to a folder (you can't move them back into your In Tray after that, unless the folder you chose was the Trash), you will find files with 8-digit hex number names still in the IPM Bin folder, some of which match your missing email. Drop them on AppleMail, which can open and save them (as long as they were sent from AppleMail). Let's hope that Apple clarifies in PowerTalk just what happens when you remove a personal gateway from your Key Chain.