AD Sync question

I have 84 users that are using Office 365. I manually created and licensed these accounts. I also have an in-house Exchange 2007 server. Management wants to migrate our e-mail to Exchange on-line. Of course I'll need to implement AD directory sync tool which will replicate our AD user accounts as mail enabled users in the Windows Azure AD. My concern is, will implementing AD sync somehow overwrite the existing accounts, possibly breaking Office 365. The ideal effect of AD sync is that it would recognize the previously created accounts and simply mail enable them. Does anyone have any insight into this?
harold9153Asked:
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Cliff GaliherConnect With a Mentor Commented:
Fair enough. Dirsync matches O365 accounts with on-prem accounts by the primary SMTP address property. Your local AD server will be authoritative though, so if there are property conflicts, your local server "wins."
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Cliff GaliherCommented:
For 84 users? I wouldn't bother with AD Sync. It is cumbersome and can easily create more problems than it solves. You can migrate mailboxes without AD Sync.
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harold9153Author Commented:
I know there are ways to migrate the mailboxes. However management wants AD sync. That;s my reason for the question.
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harold9153Author Commented:
Thank you. It sounds like there is nothing to worry about.
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harold9153Author Commented:
Will dirsync recognize the user accounts created in O365 as the same accounts as those in my on premise AD and sync any changes made to the on premise accounts?
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Cliff GaliherCommented:
They are NOT the same accounts. And no, by default the sync is one way. You can enable two way syncing, but that is not automatic.
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harold9153Author Commented:
How do you enable 2 way sync?
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Cliff GaliherCommented:
Just so we are on the same page, what specifically do you need two-way sync for. It is only used in a couple of edge-case scenarios.
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harold9153Author Commented:
I don't need it. I think I have enough to understand with dirsync and ADFS/SSO.
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