Avatar of Eprs_Admin
Eprs_Admin
Flag for Austria asked on

Cross Forrest Mailbox migration

Hi Experts,

we have a project to do with migrating mailboxes from EXCH-A to EXCH-B.
Both exchange servers belong to different forrests.

Do you have a manual or link for that ?

The EXCH-A is version 2016
The EXCH-B is version 2013.
Is this possible ?
ExchangeActive DirectoryWindows 10AzureWindows Server 2016

Avatar of undefined
Last Comment
Saif Shaikh

8/22/2022 - Mon
M A

It will be easy to use 3rd party softwares and migrate from forest A Exchange to Forest B exchange.

Can you explain what your client's requirement?
Maybe we can propose something better.
Eprs_Admin

ASKER
We will have to migrate thr mailboxes from forest A to forest B.
The users still in forest A but the mailbox is in forest B.

Can we use new-migrationbatch for that ?
Because the mailbox in the source is on EX2016 and the traget exchange is EX2013.

What do you think ?
M A

You need to have two way trust between forests and add the Target Exchange organization .
Experts Exchange is like having an extremely knowledgeable team sitting and waiting for your call. Couldn't do my job half as well as I do without it!
James Murphy
ASKER CERTIFIED SOLUTION
Saif Shaikh

THIS SOLUTION ONLY AVAILABLE TO MEMBERS.
View this solution by signing up for a free trial.
Members can start a 7-Day free trial and enjoy unlimited access to the platform.
See Pricing Options
Start Free Trial
GET A PERSONALIZED SOLUTION
Ask your own question & get feedback from real experts
Find out why thousands trust the EE community with their toughest problems.
Saif Shaikh

Taking out PST also take out the X500 address of mailboxes and add them back in the new mailboxes on migrated forest..
Jason Crawford

You're going to have to upgrade your 2013 server to 2016.  Unless you want to test your upper limit of frustration don't try to migrate using .pst files.  Since the mailboxes all live in a separate forest there is no need for legacyExchangeDn / X500 addresses either.  The challenge you'll face is password and SID history both of which are accounted for in the ADMT (Active Directory Migration Tool); however, it's not really appropriate in this instance since the AD users and mailboxes are already established in the target.  If flipping the migration from 2013 to 2016 isn't an option you'll most likely want to shell out the $9.99 per mailbox for Migration Wiz, otherwise the next best option I can think of is introducing a third forest (similar to a resource forest) to facilitate the unique position you're in.  I'm happy to help if you need a hand.
Eprs_Admin

ASKER
Hi Jason,

can you confirm, I have to upgrade the EX2013 ?

Now when I try to move the mailboxes to the new forrest with GUI, I get this error:

MapiExceptionCorruptData

Any ideas ?
⚡ FREE TRIAL OFFER
Try out a week of full access for free.
Find out why thousands trust the EE community with their toughest problems.
Eprs_Admin

ASKER
what does it mean ?

MapiExceptionCorruptData
Eprs_Admin

ASKER
do I need to trust some certificates ??
Saif Shaikh

Have you tried below command:

New-moverequest -identity "" -BadItemLimit 100 -AcceptLargeDataLoss

Modify the baditemlimit as per your needs.
Experts Exchange has (a) saved my job multiple times, (b) saved me hours, days, and even weeks of work, and often (c) makes me look like a superhero! This place is MAGIC!
Walt Forbes
Eprs_Admin

ASKER
Hi Saif,

it hasnt to do with the dataloss or baditemlimits.
I get SSL errors.
Saif Shaikh

Provide the complete error information. Incomplete information will not lead to solution.

You can remove or colour the sensitive information in the error liek domain name and all.
Eprs_Admin

ASKER
I hope I can get this info nect week
⚡ FREE TRIAL OFFER
Try out a week of full access for free.
Find out why thousands trust the EE community with their toughest problems.
Eprs_Admin

ASKER
Here is the full error:
MapiExceptionCorruptData.png
Saif Shaikh

1. Have you tried moving one or two mailboxes by themselves?

Can you move a single small mailbox over?

If yes, it may be a matter of mailbox size and this post may help:

http://social.technet.microsoft.com/Forums/en-US/exchangesvrmigration/thread/279bac54-f7bd-4d5e-884e-6c8701db13cc



2. Try modifying MSExchangeMailboxReplication.exe.config on the target CA server as follows:-

              binding name="MrsProxyClientBinding"
                 receiveTimeout="00:00:50"
                 sendTimeout="00:00:50">
          <reliableSession ordered="true" />
          <textMessageEncoding>
            <readerQuotas maxArrayLength="3048576"
                          maxStringContentLength="3048576" />
          </textMessageEncoding>
          <httpsTransport authenticationScheme="Negotiate"
                          maxReceivedMessageSize="3048576"
                          allowCookies="true" />
Eprs_Admin

ASKER
I have tested several different mailboxes, always same error.

ok I will check next week.
I started with Experts Exchange in 2004 and it's been a mainstay of my professional computing life since. It helped me launch a career as a programmer / Oracle data analyst
William Peck
Eprs_Admin

ASKER
Hi All,

I have upgraded now to Exchange version 2016.
Now on both sides I have version 2016.

What kind of config is needed to migrate from Forest A to Forest B ?
Eprs_Admin

ASKER
Thanks Saif,

after the exchange Upgrade to 2016 on site A, I was able to migrate all mailboxes.
Saif Shaikh

You are most welcome...Glad to hear your issue was resolved.
⚡ FREE TRIAL OFFER
Try out a week of full access for free.
Find out why thousands trust the EE community with their toughest problems.