Thank you so much, that is a great explanation Jonathan. Thank you also Michael.
This is what makes this forum so awesome! Kindest regards, Paul. From: [email protected] [mailto:[email protected]] On Behalf Of Jonathan Raper Sent: 21 July 2016 18:36 To: [email protected] Subject: RE: [Exchange] 365 migration. I'll address each separately (I thought I already did on Tuesday? - maybe it didn't come through) "When I create a new ad sync in the new domain after migrating the ad accounts across. Should they merge ok with the existing ad objects already in 365" You would want to have Azure AD Connect (sync) running in all domains before migrating the first mailbox is migrated. If you don't, then you'll end up with orphaned mailboxes. All Azure AD Connect does is COPY details from AD up to O365 and then synchronize changes from that point forward. If the object is deleted from AD, then at the next sync interval (by default, 3 hours), Azure AD Connect will DELETE the object from O365 (not the mailbox, just the AD Object). Before you can migrate a mailbox, you have to have the address space for your O365 exchange Online tenant defined in your on-premises Exchange infrastructure. Let's say you have two domains on-premises: Tailspintoys.com contoso.com And you want to migrate users from both domains into acmecorp.com, with the mailboxes for everyone being migrated to O365 Your O365 tenant might be: acmecorp.microsoftonline.com You would need to ensure that everyone in all domains has a secondary SMTP address of [email protected]<mailto:[email protected]> Once this syncs with O365 Exchange Online, the mailbox for a user from tailspintoys.com can be migrated to O365. At that point, Azure AD Connect will replicate changes from tailspintoys.com domain up to O365. Now, let's say you migrate the AD user from tailspintoys.com to acmecorp.com.... As soon as you do that, Azure AD Connect in the tailspintoys.com domain will remove the object from O365 (not the mailbox, just the user object). However, the Azure AD Connect in Acmecorp.com will replicate the migrated user data up to O365.... So for a brief period of time, the user won't exist in O365 (which means they might not be able to access their mailbox), however once sync happens, everything should be peachy.... Note that the User Principal Name (UPN) will be new, so the user will need to login to O365 with the new UPN of [email protected]<mailto:[email protected]> "365 and would I be stuck with the old exchange servers in the old domains or should I be able to lose them once the mail is up, I was reading that in hybrid I could be stuck with exchange for the management tools." No....and yes... Build Azure AD Connect (formerly Dirsync) for each domain (contoso.com and tailspintoys.com) Build hybrid server(s) in each domain Define/configure migration endpoints for each site/domain where exchange is on-premises Migrate mailboxes from on-premises to cloud (acmecorp.microsoftonline.com) Once all mailboxes are migrated from on-premises contoso.com, remove migration endpoint configuration for contoso.com Decommission Exchange on-premises from contoso.com Once done with everything, you end up with one hybrid server (or two if you want high availability, say, for SMTP relay) in the acmecorp.com domain My opinion is that it is desirable to maintain at least one on-premises hybrid Exchange server. Jonathan From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Paul Cookman Sent: Thursday, July 21, 2016 10:30 AM To: [email protected]<mailto:[email protected]> Subject: RE: [Exchange] 365 migration. Great, thank you for the responses. When I create a new ad sync in the new domain after migrating the ad accounts across. Should they merge ok with the existing ad objects already in 365 and would I be stuck with the old exchange servers in the old domains or should I be able to lose them once the mail is up, I was reading that in hybrid I could be stuck with exchange for the management tools. Sorry for all the questions. Sent from my iPhone On 19 Jul 2016, at 19:35, Michael B. Smith <[email protected]<mailto:[email protected]>> wrote: Yes sir. From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Paul Cookman Sent: Tuesday, July 19, 2016 1:33 PM To: <[email protected]<mailto:[email protected]>> Subject: Re: [Exchange] 365 migration. So run adsync in each domain and hybrid each to 365 and then once mailboxes are up migrate the ad objects into the new domain, is that what you are describing? Sent from my iPhone On 19 Jul 2016, at 16:42, Michael B. Smith <[email protected]<mailto:[email protected]>> wrote: I would probably create a single new tenant, and run 3 migrations into that tenant. Go ahead and migrate the existing domains to using the UPN of the new tenant/new forest. Then when you move the user accounts into the new forest, the hybrid environment will continue to work. From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Paul Cookman Sent: Sunday, July 17, 2016 4:57 AM To: [email protected]<mailto:[email protected]> Subject: RE: [Exchange] 365 migration. The new Domain is required for on premise to. Can I ask how you would deal with it? Any advice would be greatly appreciated. Regards, Paul. From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Michael B. Smith Sent: 17 July 2016 01:14 To: [email protected]<mailto:[email protected]> Subject: RE: [Exchange] 365 migration. Well, this isn't what _I_ would do. But it's just as valid as any other solution. Can I ask whether the new domain is only required in O365 or also on-premises? From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Paul Cookman Sent: Friday, July 15, 2016 2:55 PM To: <[email protected]<mailto:[email protected]>> Subject: Re: [Exchange] 365 migration. Does anyone have any advice on this one? Kind regards, Paul. Sent from my iPhone On 14 Jul 2016, at 11:43, Paul Cookman <[email protected]<mailto:[email protected]>> wrote: Hi, I have three Forests with their own exchange Orgs and need to get them all into one new 365 subscriptions. None have 365 currently. I also have a requirement to create a new domain with a new name for all forests. Currently free/busy and a shared SMTP name space is in place. My current plan is to create a new domain with on premise exchange and the new 365 subscriptions, then cross forest migrate all the three domains and mailboxes into the new domain before moving up to 365. This will give me the new domain name and the new 365 subscriptions. This will be a long coexistence project and I know there will be disruption with shared mailboxes which will be a real problem. Does anyone have any recommendations on this project, I was wondering if I could do something with linked mailboxes, moving the ad account and leaving the mailboxes where they are and then move the mailbox directly to 365 rather than into the new domain/exchange first. At this point I am not sure if this is possible or supported. Any advice would be very much appreciated. Kind regards, Paul. 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