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Cutover Migration Batch complete - Next steps to get to DirSync

Posted on 2015-02-16
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Last Modified: 2015-02-18
Migrating to Office 365 in a cutover migration.
Migration batch is complete.
All users are licensed (odd requirement that had to occur)

Question:
What is the next step? Delete Migration Batch?

Do I schedule downtime with users at this point?
Do I point MX records (to 365) after I delete the Migration Batch?
Do I then run DirSync during this outage window?
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Question by:K B
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Accepted Solution

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Vasil Michev (MVP) earned 500 total points
ID: 40613035
Dirsync can wait, make sure everything is migrated properly, then complete the batch and switch the MX. In the meantime, you can run some checks to make sure the cloud users will be correctly matched with the on-prem ones. As the cutover process uses the WindowsEmailAddress to provision accounts, make sure all the relevant attributes are properly configured and there will be no surprises later.

Since the objects are already created, you might end up with duplicate objects in dirsync fails to 'match' them. The usual process is to just get rid of the new one (the one that does not correspond to a mailbox) and redo the sync, this time making sure that the primary SMTP addresses match. Here's the article describing the soft-match process: http://support.microsoft.com/kb/2641663
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Author Comment

by:K B
ID: 40614124
1. Change MX
2. Disable on-premise AutoDiscover and ActiveSync
3. Install & configure DirSync
4. Create autodiscover record
5. create new profile for all user's Outlook and mobile device
6. Delete the cutover migration batch.
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Author Comment

by:K B
ID: 40614135
downtime should be scheduled over an evening.
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by:K B
ID: 40615310
With on-premise Exchange 2007, prior to DirSync, you have to convert all the Exchange users to Mail-Enabled Users (MEUs) in AD.
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Expert Comment

by:Vasil Michev (MVP)
ID: 40615340
Not necessarily, it's recommended but not mandatory. You can soft-match against mailboxes too.

The only issue you might run into is for mailboxes that weren't copied during the cutover process (i.e. hidden from the GAL or failed for some reason). As you have active on-prem mailbox for those objects, the relevant attributes will be synced to EO. You will not be able to create mailbox in EO for such objects unless you convert the on-prem mailbox to MEU.
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Author Comment

by:K B
ID: 40618049
Confirmed what you said that it is not necessary to convert to MEUs .... Yet again, Vasil, many thanks!!!
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