Installing Active Directory Synchronization for Office 365


We are currently at the very early stages of migrating Office and mainly Exchange mailboxes to Office 365.

I have found one implementation guide that states you have to completely remove the on premise exchange server (Exchange Server 2003) from AD as a prerequisite before installing and configuring ADSYNC on a server  but can't find this stated in any other guides.

Not sure how you would then move the mailboxes.  I have already backed up Exchange and exported mailboxes to PST.  

Does anyone know if this is correct?  I only have about 30 mailboxes to move.

Many thanks
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I would use this:

Microsoft Exchange Server Deployment Assistant
Launch assistant choose cloud only and follow instructions.

Don't remove exchange server before migration is over
nickpinderAuthor Commented:
Thank you capnet  for the quick response.  

Looks like just the thing I was looking for.

I will work through this and update..  Might be later today or tomorrow now but again many thanks.

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Sudhir BidyeCommented:
Everything you need to know is mentioned in this article.
Go through each and every step carefully specially the soft matching part mentioned on page 3.
Vasil Michev (MVP)Commented:
No such thing as needing to remove Exchange to run AADSync, either the article mentioned that in some other context or it's plain wrong. For 30 mailboxes you can go with cutover migration however, which doesnt require AADSync.
nickpinderAuthor Commented:
Thanks Vasil not had a chance to implement anything as yet.  Hoping for tomorrow or weekend when users not logged on.

Just for info a snippet is attached from "Office 365 migrating and managing your business in the Cloud" by Matthew Katzer and Don Crawford"

I'll not be taking the books advice.

Many thanks
Vasil Michev (MVP)Commented:
I think what they meant by that bit is that Exchange will interfere with Outlook when you try to configure the cloud mailbox, i.e. the Autodiscover query. But that's not always a problem, it might actually be desired in some cases. Plus there are ways to work around it, other than removing the Exchange server that is.
viveksahuLead ConsultantCommented:
Here is my solutions for your environment.

Install DirSync on member server
Install Exchange 2010 SP3 hybrid setup (license not required) on member server, also install the SAN/wild card certificate.
Create a CNAME record for your domain like (replace the domain) pointing to obvious this step will disable the outlook autodiscover ability for on-prem users but will enable for cloud migrated users.
point MX to cloud and create outbound connector to forward mail to your on-prem server (don't remove your existing MX until migration over, just change the priority.)

Once all setup and users are synced to cloud, run the new-moverequest below command.

new-moverequest -identity -remote -remotehostname -targetdeliverydomain -baditemlimit 50 -remotecredential $cred_on-prem

Let me know if you might have any more questions.

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nickpinderAuthor Commented:
Thanks for everyone's help on this all sorted now.
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