Redtail Technology Email is IMAP Email. This technology is antiquated
IMAP, does work, but is limited on how it synchronizes all data.
Redtail Technology is a good company. They sell an email package that includes archiving and Journaling for complianace. However, they use IMAP technology on their email solutions which have limiting synchronization capabilties. Moving to Office 365 is a significantly better solution that synchronizes all things in Outlook and does so for all of your devices.