Yes, Kevin, you are right in that IMAPSync will not cause any downtime. In fact, none of the systems will have a downtime. However, there will be a downtime in service to the user because we would be changing the password in order to do the IMAP migration - since, IMAPSync will not transfer messages unless we provide it with the User's Password on both IMAP Servers.
This password will not be known to the User - and so he will not be able to access his mailbox while the messages are being transferred. Because, even if I use Zimbra's Internal Authentication, I would still need to Authenticate myself on Surgemail.
We are currently in the process of testing Zimbra and if all is well - maybe in a few months - we would migrate completely to it. In addition, so far the most universal thing is IMAP and so to keep integrity of emails in a format that can be used by "any" email aplication it is essential to maintain Surgemail - atleast for the time being - until our organization decides to part from it.  |