The Banshee server is scheduled for migration on Saturday, June 15th. These events are expected to result from the migration:
A brief moment where your email clients return in error about the SSL certificate. To be resolved within 5 minutes.
Recently moved or deleted emails reappearing. Once the migration is complete we do one final sync from the previous server. You may have moved an email from one folder to another, or perhaps deleted it, on the new server while it still exists in it's original location on the old one. This causes the email to reappear. It's a very specific set of actions in a very limited window that trigger it, and not something most users will see. If you do see it, consider it a one-time issue.