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Eprs_Admin
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urgent cross forest migration

Hi Experts,

i have an urgent issue with mailbox migrations from another forest to our forest.
Please can you help me out ?

All mailboxes now in Forest-A on a EXCH Server 2016.
The company was bought.

Now we have to migrate all mailboxes to Forest-B to EXCH2013 Server.
I have tried this with a cross forest migration with the script .\PrepareMoveRequest.ps1
But it is not working, see the error here:

MigrationPermanentException: Error: MapiExceptionCorruptData: Unable to write mailbox info. ‎(hr=0x8004011b, ec=-2147221221)‎ Diagnostic context: Lid: 1607 StoreEc: 0x8004011B Lid: 1494 ---- Remote Context Beg ---- Lid: 36024 StoreEc: 0x8004011B Lid: 59009 StoreEc: 0x8004011B Lid: 53912 StoreEc: 0x8004011B Lid: 1750 ---- Remote Context End ---- Lid: 9954 StoreEc: 0x8004011B 

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More Infos:
The Two-Way Trust is established.
The MRSProxies are enabled on both EXCH-Servers.
The Endpoint is created on the Target-EXCH-Server.
The Script ( PrepareMoveRequest ) works but the Migration with ECP GUI not.

Please help me out this is really urgent.
ExchangeActive DirectoryWindows 10AzureWindows Server 2016

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Last Comment
Mahesh

8/22/2022 - Mon
Mahesh

From error it seems that there is network / access related issues

You need to ensure that Any-Any network communication is allowed between below

source 2016 MBX server - Target Exchange 2013 CAS and MBX servers
Source 2016 MBX server - Target DC servers
Target exchange CAS and MBX servers - Source DC servers

You should have organization management group membership account credentials in source and target + local admin rights on respective exchange server
Shabarinath TR

Hello,

Not sure if thats a supported option since you are trying for a cross forest migration from Exchange 2016 to Exchange 2013.

In Exchange 2016, you can move an Exchange 2010, Exchange 2013, or Exchange 2016 mailbox from a source Exchange forest to a target Exchange 2016 forest. If there's at least one Exchange 2016 Mailbox server in the target forest, the forest is considered an Exchange 2016 forest.

In Exchange 2019, you can move an Exchange 2013, Exchange 2016, or Exchange 2019 mailbox from a source Exchange forest to a target Exchange 2019 forest. If there's at least one Exchange 2019 Mailbox server in the target forest, the forest is considered an Exchange 2019 forest.

I dont have experience on Cross forest mailbox migration, but from what I could read out - You have to introduce at least one exchange 2016 on the target exchange organization.

Good luck.

Shaba
Mahesh

Its supported, he is not migrating in same forest, he's migrating from one forest to another
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Eprs_Admin

ASKER
Yes , I have checked the permissions, we used the domain admin.
And the user is also member of OrganizationManagement.

Yes I migrate to another forest.
Eprs_Admin

ASKER
More Infos:

SourceAD is 2016.
TargetAD is 2008R2.

Is this a problem with the Schema ?
Eprs_Admin

ASKER
any new or infos ?
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Sajid Shaik M

Exchange 2016 CU2 and earlier      Exchange 2013 SP1 and later are compatible with windows 2008R2 and 2016

please go through

https://docs.microsoft.com/en-us/exchange/architecture/mailbox-servers/prep-mailboxes-for-cross-forest-moves-in-powershell?view=exchserver-2019

step by step

all the best
Eprs_Admin

ASKER
Hello Sajid,

Thanks for your link and I did this many times.
But I still get the same error. What can be the problem ?
Mahesh

I realize that Shabarinath is correct.
If you look at MS documentation, even with cross forest you can migrate from lower to upper version but not in reverse direction
You need to look at 3rd party tools I believe, they will make it possible
Your help has saved me hundreds of hours of internet surfing.
fblack61
Eprs_Admin

ASKER
ok, what about the certificates ?
Do I need them ?
Mahesh

Yes, you do need public certificates at both ends for efficient connectivity and migration even through 3rd party tools
Eprs_Admin

ASKER
Ok, in the meantime I have installed a second EXCH2016.

But now I get some other errors: migration-error
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Eprs_Admin

ASKER
Please, what is the correct manual ?

MRSProxies enabled.
Endpoint created.
Prepare-Moverequest.ps1 started and succeeded.

But Migration batch always fail :-(
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Mahesh

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Eprs_Admin

ASKER
no public certs in use, because of a test lab
Eprs_Admin

ASKER
Do I need certs ? Which ones ?
On the testlab , no CA is installed.
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William Peck
Eprs_Admin

ASKER
Now the cross forest mailbox migration from 2016 to 2016 works.
Mahesh

Now the cross forest mailbox migration from 2016 to 2016 works.

It is 2013 to 2016.........?