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How to use ADSI Edit to modify the federated user’s mailbox

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How to use ADSI Edit to modify the federated user’s mailbox

Postby blin » Fri Feb 05, 2016 10:52 am

Q: Since Office 365 default mailbox is mycompany.onmicrosoft.com, how can I change the default mailbox to mycompnay.com?

A: If you are in a SSO (Single Sign-On)/federated environment of Office 365, you may need to modify the federated user’s attributes in the on-premises AD server, then sync the changes to Office 365 via DirSync. For example, the primary STMP address can be changed by modifying the ProxyAddresses attribute using the syntax “SMTP: user@contoso.com” (case sensitive).
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Re: How to use ADSI Edit to modify the federated user’s mailbox

Postby blin » Fri Feb 05, 2016 12:05 pm

Quoted from Microsoft
SOLUTION
To work around this behavior, create a matching user account in the on-premises Active Directory Domain Services (AD DS) environment, set up the user principal name (UPN) appropriately, and then sync the account and Azure Active Directory by using directory synchronization. To do this, follow these steps:1.Obtain the primary SMTP address of the Office 365 user account. To do this, follow these steps:a.Sign in to the Office 365 portal (https://portal.office.com) as a global admin.
b.Click Admin, and then click Exchange to open Exchange Admin Center.
c.Locate the user account, and then double-click it.
d.In the left navigation pane, click Email Address, and then note the primary SMTP address of the user account.

2.Start Active Directory Users and Computers, and then create a user account in the on-premises domain that matches the Office 365 user account. For more information about how to do this, go to the following Microsoft TechNet website:
Create a User Account in Active Directory Users and Computers

3.Make sure that the UPN of the user account is updated to the federated domain name. For more information about how to do this, see the following Microsoft Knowledge Base article:
2392130 Troubleshoot Active Directory user accounts that are piloted as Office 365 SSO-enabled user IDs

4.Use Active Directory Service Interfaces (ADSI) Edit to edit the proxyAddresses attribute of the user object so that it matches the primary SMTP address that you noted in step 1D. To do this, follow these steps:

Note For more information about how to install ADSI Edit, go to the following Microsoft website:
Installing ADSI Edit

a.Click Start, click Run, type ADSIEdit.msc, and then click OK.
b.Right-click ADSI Edit, select Connect to, and then click OK to load the domain partition.
c.In the navigation pane, locate the user object that you want to change, right-click it, and then click Properties.
d.In the Attributes list, click the proxyAddresses attribute, and then click Edit.
e.In the Value to add field, enter the appropriate SMTP address, and then click Add.

Note The primary SMTP address value for the user object should be prepended by an uppercase "SMTP:" designator for the address value to be formatted correctly for the proxyAddresses attribute. For example, "SMTP:username@contoso.com" is an acceptable value, and "username@contoso.com" isn't an acceptable value.
f.Click OK two times, and then exit ADSI Edit.

For more information about how to use ADSI Edit to edit Active Directory attributes, go to the following Microsoft TechNet website:

Using ADSI Edit

5.Force directory synchronization. For more information about how to do this, go to the following Microsoft website:
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