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Every time you open Outlook 2007 you are prompted to enter your domain credentials ,even though you know you have saved it?

To solve it try that one:
Open the following path:
In Vista C:\Users\YourUserName\AppData\Roaming\Microsoft
Once open you will see numerous folders including a “protect” folder.
Delete the “protect” folder
When you have deleted the protect folder, restart Outlook.
You will be requested to enter your password again, but it will be the last time.

If problem exist When working RPC over HTTPs

If you are working RPC over https you are using or basic, or NTLM authentication
you need to be sure you are working NTLM.
Now in order to ensure that outlook not uses any cached password we need to do the following.
Go to Control Panel>User Acounts
Press on Advanced Tab button
Click on Manage Passwords button
Review stored passwords , and if you see IP address of your mail server you should delete it.

Now we need to patch te registry

1. Click Start|Run
2. Type regedit and press enter
3. Go to HKLM\SYSTEM\CurrentControlSet\Control\Lsa\
4. Find lmcompatibilitylevel DWORD parameter
5. Double-click on it and change its value to 3

If “Remember my password” doesn’t work and you keep getting prompted:

1. Close your Outlook
2. Go to Start… Run and type control userpasswords2 and press OK c) click on the Advanced tab and press ‘Manage Passwords’
3. Find the entry for your mail server and click ‘Properties’
4. Erase the Server name and type in ‘S1′ or whatever the simple name of your global catalog server is (without the quotes)
5. leave the password blank and click OK
6. Start Outlook, enter your password and check off ‘Remember my password’ one last time. It should not prompt again.

When you start Microsoft Outlook 2000/2002, you may receive following error messages:

Your logon information was incorrect.
Check your username and domain, then type your password again.
The logon credentials supplied were incorrect.
Make sure your username and domain are correct, then type your password again.
CAUSE
This behavior occurs because registry may be missing one or more values in the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Rpc\ClientProtocols
The following values are the core required values for Windows XP or Windows 2000:
Name Type Data
(Default) REG_SZ (value not set)
ncacn_http REG_SZ Rpcrt4.dll
ncacn_ip_tcp REG_SZ Rpcrt4.dll
ncacn_np REG_SZ Rpcrt4.dll
ncacn_nb_tcp REG_SZ Rpcrt4.dll
ncadg_ip_udp REG_SZ Rpcrt4.dll

The following values are the core required values for Windows 98:
Name Type Data
(Default) REG_SZ (value not set)
ncacn_np REG_SZ Rpcltc1.dll
ncalrpc REG_SZ
ncadg_ip_udp REG_SZ Rpcltc3.dll
ncacn_http REG_SZ Rpcltccm.dll

The following values are the core required values for Windows NT 4.0:
Name Type Data
(Default) REG_SZ (value not set)
ncacn_np REG_SZ Rpcltc1.dll
ncalrpc REG_SZ
ncadg_ip_udp REG_SZ RpcLtCcm.dll
ncadg_ip_udp REG_SZ RpcLtCcm.dll
ncacn_nb_tcp REG_SZ RpcLtCcm.dll
ncacn_http REG_SZ RpcLtCcm.dll
Following the system’s protocol binding order, you receive a prompt for credentials on each missing value until a value that matches the next protocol in the binding order is reached.
RESOLUTION
Use one of the following methods to resolve this behavior.
Method 1
Import a valid registry key from a computer that is working correctly. To do this:
1. Start Registry Editor (Regedt32.exe).
2. Locate and then click the following key in the registry:
KEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Rpc\ClientProtocols
3. Click the ClientProtocols key.
4. On the File menu, click Export.
5. Save the file with a .reg or a .txt extension in the event you need to send the file by using Outlook. You must save and rename the attachment to a .reg extension to import the key.
6. Quit Registry Editor.
7. Rename the file that you just exported from a .txt file extension to a .reg extension, and then copy it to a folder on your computer.
8. Start Registry Editor (Regedt32.exe).
9. Locate and then click the following key in the registry:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Rpc\ClientProtocols
10. Select the ClientProtocols folder, click File, and then click Import.
11. Select the .reg file that you saved, and then click Open.
12. Quit Registry Editor.
13. Quit and then restart Outlook 2002.
Method 2
Use Registry Editor to manually create the missing values. To do this:
1. Start Registry Editor (Regedt32.exe).
2. Locate and then click the following key in the registry:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Rpc\ClientProtocols
3. Click Edit, click New, and then click String Value.
4. Edit the new string value with the name and data information that is in the table in the “Cause” section of this article.
5. Repeat steps 3 and 4 for each missing value.
6. Quit Registry Editor.
The information in this article applies to:
• Microsoft Outlook 2002 (Outlook XP)
• Microsoft Outlook 2000
• Microsoft Exchange 2000 Server
• Microsoft Exchange Server 5.5

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