Error in setup Exchange

[csco]

Error when setup exchange server 2007 standard edition on windows server 2003 r2 standard edition
(The exchange organization not in native mode)
ارجوالافادة وشكرااا

[Mohammad Saad]

This means that you didn't meet the software compatibility checks :

Before you begin installing Exchange Server 2007, you should make sure that the computer on which you are installing the product meets the recommended hardware and software requirements

- you should make sure that the Active Directory domain in which you are installing Exchange Server 2007 is configured with the correct functional level

- The minimum Windows Active Directory functional level for Exchange 2007 is Windows 2000 native mode. If you are installing Exchange Server 2007 into an existing Exchange organization, it is also important to note that the organization should be running in native mode;

[myhome]

اذهب لل DC
و اختار
start --> administrative tools --> Active Directory Domain and Trusts
اعمل كليك يمين على اسم ال Domain
واختار Raise Domain Function Level
بعد كدة اختار من السهم
Native mode
او
Windows server 2003
بعد كدة اضغط على Raise
بعد كدة كمل Exchange Installation