You need Mobile Sync checked for the phone to do Active Sync.
Wild Guess: the CEO is doing just IMAP for email, and has separate contacts/calendars in the iPhone which are not currently in Zimbra.
So, before you reconfigure the phone (just checking the tickbox in the admin console won't change the phone), I'd ask which calendar/contacts the ceo uses. If they are on the phone only, you'll want to get them and import them into Zimbra before you reconfigure the phone to do Active Sync.
Hope that helps,
Mark
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___________________________________ L. Mark Stone, CIO "Uptime. All the time."
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