This Migration Guide will help you to migrate mailboxes across forest Its always people go confused when source and target forests are Exchange 2010, I have tried to explain as detailed a possible and covered one method where “Running .\Prepare Move Request.ps1 first and then using ADMT to migrate the Sid History” of the users Please share your feedback in comments , So that I can update the guide frequently so lets go ahead Step 1: Have Trust in place across forests , In my Situation I created Two way Transitive Trust where I won’t get into any permission constraints Good to know : We can limit permissions by going for different type of trusts See – How to Create Two way Transitive Trust – Windows Server 2008 R2 Step 2: You need Active Directory Migration Tool to Get your User accounts migrated without any hassle, You can install it in either of the forests but , Have installed in the target forest , where I will be doing most of my work See – How to install ADMT 3.2 in Windows Server 2008 R2 Step 3: If you are planning to Migrate the User account with SID – Which is recommended – where users will still have access to their old forest where they will be recognized like access to file shares and permission groups .So I would always recommend to get your SID along with the Users If you are planning to Migrate Users with Password that doesn’t happen by default , You have to Configure “Password Export Server” in the source domain See – How to Migrate Users Across forest (Cross Forest) using ADMT 3.2 with sid and Passwords Step 4: Enable MRS Proxy on the Source Client Access Server which is going to Facilitate the Remote move from the Source Forest, I have described Enabling MRS proxy where version is Exchange 2010 Sp1 or later cause enabling in RTM version differs See- How to Enable MRS Proxy and Increase timeout In Exchange 2010 Step 5: Ignore if you are not using a Self Signed Cert. they go for bulk migration Step 7 : Created a Test Mailbox – Mailbox1 Step 8: First Store the Access Credentials in the Shell Please don’t confuse yourself Here.The deadline for comments for Candidate Recommendation is 31 October 2017.
In telecommunications, transmission (abbreviation: Tx) is the process of sending and propagating an analogue or digital information signal over a physical point-to-point or point-to-multipoint transmission medium, either wired, optical fiber or wireless.If you are using a Self Signed Certificate –Where Exchange servers won’t authenticate between each other Because they won’t trust each of them You got to Export the Cert from Source Exchange Server and import it on Target Exchange Server Vice versa See – How to Export a Self signed Server Certificate and Import it on a another Server in Windows server 2008 R2 Step 6: Check List Before starting, There are many methods to Move mailboxes across forest . let us call this method as “Running .\Prepare Move Request.ps1 first and then using ADMT to migrate the Sid History” We will move one mailbox to get a Clear idea , Then we can go for Bulk Migration of mailboxes. Am Running this on the Target Forest – $local Credentials Means the Target Forest Credentials Source Forest – care Target Forest – Target Please don’t forget to Type the Domain Name\User Name (Note: If it fails with Error – Authentication Failed – Try Entering Domain.Com\Username ,or .local refers to your local domain) Means my Source Forest Note : After Storing your Credentials – Do not Close Shell – You got to run the Future Command in the Same Power Shell Session Step 9: Now Preparing a Move Request Browse your Exchange Management Shell into Scripts Folder in your Target Forest , Which will be in Exchange installation Location .\Prepare-Move Request.Ps1 -Identity "Email Address" -Remote Forest Domain Controller "FQDN of Source DC" -Remote Forest Credential $Remote Credentials -Local Forest Domain Controller "FQDN of Target Forest DC" -Local Forest Credential $Local Credentials -Target Mail User OU "Distinguished name of OU in Target Forest" –Use Local Object -Verbose Using –Verbose in the end of the Command You can clearly see what are the Attributes its getting touched Mail, Display name, Proxy address etc..Now you can See a Disabled account which has been Created on the Specified OU Step 10: Now use ADMT to migrate the SID and Enable the Target Account which is “Mailbox1” in my Scenario See- How to Migrate Users Across forest (Cross Forest) using ADMT 3.2 with sid and Passwords Now you can find the SID history of the account , Where you can confirm that you did things correctly Now your AD account will get Enabled Step 11: Now your Account with SID and password as been moved, But still your Content of the mailbox hasn’t moved yet.Step 12: To Move the Users in Bulk See- Cross forest Move Mailbox in Bulk – Exchange2010 to Exchange 2010 Step 13: If you doesn’t want to share free/busy information as of now.