The following issues can cause this:
a) the branch side changed the service account password, later the branch changed the password back to the original and the synchronization service was not restarted.
b) a encryption key was corrupt (deleted) and new keys have been generated and exchanged.
E-mail flow has been restored but there are currently many items in the Branch/HQ service account mailbox.
Is it safe to remove all these messages from the mailbox?
Should the service be restarted?
