The three options for the default
sign-in format are :
FullDomain : This
is the domain and user name of the user in the format
domain\user name. For example, for a user named
Tarek.Majdalani in the domain elmajdal, the sign-in
would be elmajdal\tarek.majdalani
PrincipalName : If user principal name
(UPN) sign-in format is specified, the User Name field
on the Outlook Web App sign-in page guides the user to
enter their e-mail address. For example,
[email protected].
UserName : This is the user name only
and doesn't include the domain name. For example,
tarek.majdalani
These options change only the text
on the Outlook Web App sign-in page. They don't cause a
particular format to be required. The user can use any
of the standard sign-in formats regardless of the text
on the page.
To change OWA forms-based logon
option, follow the below steps :
-
Open Exchange Management
Console, and then from the left side pane, expand
Server Configuration and click on
Client Access

-
From the middle pane, and under
the Outlook Web App tab, right click on
owa (Default Web Site) and click
Properties

-
The owa properties will open,
click on the Authentication tab

As you can see, under the forms-based authentication
section,
three authentication options available:
-
Domain\user name
-
User principal name
(UPN)
-
User name only
The default logon
option is by typing
DomainName\UserName
and this is how it looks like on OWA

It prompts the user to enter : elmajdal\tarek.majdalani
for example.

-
If you want to change it to be :
User principal name (UPN), then select the second
option and click on OK

This how it will look like on owa. You are
guided to enter the [email protected] as shown below


-
The most common used option, is using
the third option which is the User name only
Select the User name only option, and then you will
need to select the Domain name. Click on the
Browse button

The list of available domains in the forest will be
displayed. Select the domain name and then click on
OK

The selected domain name will be displayed under the
Logon domain textbox. Click OK

below you can see how the User name only will display the
authentication option on owa


-
Last thing to mention, is that
when you change from one authentication option to
another, you will be presented with a warning
message, that the changes won't be applied till you
restart IIS.

You can do this either through command prompt or
through IIS management console .
To restart IIS using command prompt, then open
command prompt in elevated mode and type :
iisreset /noforce


or by opening IIS Manager , and the from the
left side node, click on your Server name , and then
from the right side pane, under Actions
click on Restart


The changes will be applied. Now open your server
OWA page, for example
https://mail.elmajdal.com/owa ,
and check how the selected authentication option is
displayed now.
Summary
Forms-based authentication gives you
three options for the default sign-in format. These
options change only the text on the Outlook Web App
sign-in page. They don't cause a particular format to be
required. The user can use any of the standard sign-in
formats regardless of the text on the page.
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