Yes -- Zimbra NE has ZCO.
Here were your 2 original statements:
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3) probably more a migration issue, but many imported calendar items just say Busy and no longer say the the subject of the actual event.
4) Ever noticed that the outlook zimbra connector takes up a lot of bandwidth even way after the imports have been completed? I am not 100% on this, but the small offices internet appears to be extremely slow (almost unusable at times) the same day i switched them to zimbra from imap/pop3.
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LOL, the reason for the confusion is that nowhere in there was a complete explanation of what you were doing.
"Migration" is a broad term, and I take it generally to mean you used a wizard and got all your data, contacts and calendar included, into our server.
"Imports" is a broad term -- the data could have come from anywhere, but as our tools are called Import wizards, I assumed the same thing I assumed with the first statement.
"After the imports have been completed" means that you are now using ZCO, and syncing both ways.
You also mentioned "initial syncs were still happening", indicating the initial download from the Zimbra server. I didn't understand that you were doing this in a two step process. LOL.
Anyway, if it were me, I would forget the PST stuff, and find a way to import your contact and calendar data into the server. As you say:
"When you install the Outlook connector, it creates a new profile in Outlook, thus non of the existing pop3 email is available."
So why not get it into the Zimbra server before you even deal with Outlook? The Zimbra server (web client) has an import/export utility. You can import comma separated files into Contacts, and .ics files into calendar. Is there a way to get your existing data into those formats (.csv for contacts, .ics for calendar), import into the server via the web client (or rest or curl or something), and afterwards, just sync to Outlook via your normal ZCO profile? Then you're just doing downloads, not uploads.