Our local private message system StickyMail is going to go through an update some time in the next two weeks (I will give warning before it happens).
When we do switch over to the new code, the old inbox format is changing. Old messages "may" be lost. You can just about count on it.
If you would like to save your current messages stored in folders, please use the "E Forward" option. Go to the folder you wish to save, check the box next to the messages, and click on the "Eforward" icon at the bottom of the list. You will be prompted for the format of messages. Click ok, and the messages will be emailed to your profile listed email address.