Linked Mailbox in Exchange Server 2013 – Part 1

In this blog series we will be learning how to create linked mailbox in Exchange Server 2013. First let me explain what is linked mailbox. Linked Mailbox was first introduced in Exchange Server 2003. Configuring linked mailbox in 2003 was little difficult and time consuming. In Exchange Server 2007 and 2010 it was upgraded and we had EMC and EMS to manage linked mailbox. Exchange Server 2013 has brought some additional features which is awesome. Linked Mailbox was introduced to reduce the extra effort put by an Administrator.

In what scenarios Linked Mailbox will be benefitted.

  1. Two companies merging and they prefer to have only one Messaging Server, however they want to secure their identity by keeping their email addresses and logon information same. Mailbox will be created in resource forest.
  2. Two companies planning to manage only one datacenter. By which mission critical applications can be managed from a central location. Accounts forest will have only accounts and Resource forest will have Exchange Server.


Account should be a member of Enterprise Admins Group

Active Directory Domain Trust much validate each other.

Fully functional DNS.

One way trust is enough, however in our scenario I have created two way trust.


  • Account Forest

Domain Name : MSEXCH.IN

Operating System : Windows Server 2008 R2

IP Address :

  • Resource Forest


Operating System : Windows Server 2008 R2

IP Address :


Figure 1.1 : Two forest with transitive trust

Exchange Server 2013 is already running in Resource Forest. Lets create trust and validate before we begin with mailbox creation.


Figure 1.2 : Adding Forwarders from Account Forest

In figure 1.2 we will add forwarders using DNS management console.


Figure 1.3 : Adding Forwarders from Resource Forest.

In figure 1.2 and 1.3 we have added forwarders and the name is resolved. Our DNS is ready. Open Active Directory Domains and Trust and create forest trust.


Figure 1.4 : Two way trust created from Account Forest.

In figure 1.4 two way trust is created. If trust creation fails then check the account used to create trust and also DNS.


Figure 1.5 : Checking the trust from Resource Forest


Figure 1.6 : Validating trust.


Figure 1.7 : Trust Validated.

In the next part series we will create Linked Mailbox using EAC.

If you wish to read the other parts of this blog series please click below.

Linked Mailbox in Exchange Server 2013 – Part 2

Linked Mailbox in Exchange Server 2013 – Part 3

Linked Mailbox in Exchange Server 2013 – Part 4

Happy Learning


MSEXCHANGETEAM | Ideas That Clicks

Like this post? Please share to your friends:
Leave a Reply