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AD Sync question

Posted on 2013-05-31
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Last Modified: 2014-11-12
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?
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Question by:harold9153
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LVL 61

Expert Comment

by:Cliff Galiher
ID: 39213034
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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Author Comment

by:harold9153
ID: 39213264
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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Cliff Galiher earned 1500 total points
ID: 39213330
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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Author Comment

by:harold9153
ID: 39213573
Thank you. It sounds like there is nothing to worry about.
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Author Comment

by:harold9153
ID: 39214226
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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LVL 61

Expert Comment

by:Cliff Galiher
ID: 39215145
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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Author Comment

by:harold9153
ID: 39234816
How do you enable 2 way sync?
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LVL 61

Expert Comment

by:Cliff Galiher
ID: 39234829
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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Author Comment

by:harold9153
ID: 39235326
I don't need it. I think I have enough to understand with dirsync and ADFS/SSO.
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