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Staged Office 365 migration (exchange)

Hi, i need to migrate the mailboxes from a SBS2008 server to exchange online (office 365).
It is a  domain.local and i do not use Dirsync,ADFS.
I know how to make the  required DNS records on the Office 365 portal.
What changes are required on the DNS server (SBS2k8) so that outlook uses the Office 365 infrastructure? An SRV record  with the settings Domain: domain.local,Service:_autodiscover,protocol: _tcp,host offering this service:autodiscover.domain.com or a cname record or just nothing ?
I have also some mailbox users using the same SBS server with their  member clients in the domain.local but they use another smtp domain name and will not be migrated for the moment.Can they still work without any issue? Thank you
ExchangeMicrosoft 365

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Alan Hardisty

8/22/2022 - Mon
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Alan Hardisty

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colin_Paul

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ASKER
antwerp2007

Thank you all for the advice,i'll read the information :it is a small migration:22 mailboxes on monday for the users with the main domain name and soon 15 mailboxes with the other smtp domain name.
I let you know how the migration is going...
ASKER
antwerp2007

The migration was not what i expected.I migrated during the weekend the mailboxes with migrationwiz and noticed (too late) that there were mails missing (many subfolders).
I changed the required DNS records regarding mail,added a DNs record cname autodiscover to the local DNS zones (SBS-server) and on monday the first 2 new outlook profiles were created succesfully.All the other profiles prompt for the credentials and autodiscover seems not to be working (anymore)? I searched every mailserver resource with the remote connectivity analyzer and used this information on the profile.
Vasil Michev (MVP)

Most likely Outlook is connecting to the local server first. Disable the mailboxes locally and use the registry fix in the article I gave above. If that doesnt help, run the "Test e-mail auto config" wizard locally and put the results there.
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Alan Hardisty

I migrated 200Gb of data and it took about a week to migrate properly.  It does an initial sync and then once that is complete, it does a daily update sync.

How much data were you looking to migrate?

Outlook prompting for Credentials suggests that the client does not meet the criteria to run Office 365 in as much as it is missing updates.

Sign in to https://portal.microsoftonline.com as the user, run the setup program and then let it tell you if the client meets the criteria needed or needs updates.  Let it finish and once it is, then you will be able to create an Outlook profile happily (assuming you zapped the Autodiscover Virtual Directory from your own server as I suggested in my initial post).

Alan