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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