1. After installing Enterprise Portal, the home page and all the pages have the Microsoft Dynamics Ax Logo set, by default.
2. To change the company logo on the Enterprise portal page and to replicate the changes on all the EP pages, please refer to the file defaultax.master.aspx file. This is a .aspx file. The default location of this file is as mentioned below.
<%systemdrive%>:\Program Files\Common Files\microsoft shared\Web Server Extensions\14\TEMPLATE\FEATURES\DynamicsAxEnterprisePortal
At the above mentioned location, you will find a defaultax.master.aspx file. Edit the line highlighted below.
Before changing the logo, add the new image file to the location mentioned below.
<%systemdrive%>:\Program Files\Common Files\microsoft shared\Web Server Extensions\14\TEMPLATE\LAYOUTS\ep\images
For example, if you have created .png image file by the name newdynamicslogo.png , then paste it to the image folder available under
C:\Program Files\Common Files\microsoft shared\Web Server Extensions\14\TEMPLATE\LAYOUTS\ep\images
Now, replace the following line of code in the defaultax.master.aspx
3. Refresh the Enterprise Portal page, after the changes are saved on the defaultax.master.aspx and the changes will be instantly reflected on the Enterprise Portal site collection.