How do I save my Outlook Password?

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When using RPC/HTTPS connection in Outlook, you will need to follow the instructions below to store your password so Outlook will not prompt you for credentials. You must be running on Windows XP or Vista (any edition except Windows Home).

1. In Outlook 2003,  go to: Tools > Email Accounts > Click Next to View or change existing email accounts > Highlight Microsoft Exchange Server and click Change.
   In Outlook 2007, go to Tools > Account Settings > doubleclick Microsoft Exchange.
2. Click More Settings > Connections tab > Exchange Proxy Settings.
3. Select NLTM Authentication as the Proxy Authentication Setting
4. Check Connect using SSL only
5. Outlook 2003: check Mutually authenticate the session when connecting with SSL
   Outlook 2007: check Only connect to proxy servers that have this principal name in their certificate
6. The Principle name for the proxy server is in the following format:
   • msstd:proxy.server.com   (proxy.server.com is the same as the Proxy Server URL)
7. Click OK and close all the Outlook Settings Windows
8. Launch Outlook, and when prompted for your username and password, make sure to check the box ‘Save Password’ and login.
9. In Windows, click the Start Menu > Run > Type in "control keymgr.dll’"
10. You’ll see Credential Manager window with an entry with the Exchange Server name.
11. Change Windows credentials:
    • Exchange 2010 account:
      t-decoration: underline;">Fow Windows XP: Select an entry with Exchange Server name and hitProperties. Replace an entry in the Server field with "*.exch021.domain.local".
      For Windows Vista: you will need to add a new entry. Hit Add button. Type "*.exch021.domain.local" in the Log on to field. Enter your primary email address as a username and your mailbox password. Credential type should be set to "Windows Logon Credential".
      For Windows 7: you will need to add a new entry. Use "Add Windows Credentials" link in the top of the list. Type "*.exch021.domain.local" in the Internet or Network Address field. Enter your primary email address as a User Name and your mailbox password.
    • Exchange 2007/2003 accounts:
      Fow Windows XP: Select an entry with Exchange Server name and hit Properties. Change the first portion up to the first period ‘.’ with an asterisk ‘*’. To get the correct server information please go toCONTROL PANEL > Get Started > Advanced Settings > Exchange Server. 
      "Exvmbx017-10.exch017.your_server.net"  should be changed to "*.exch017.your_server.net" (without quotes
      For Windows Vista: you will need to add a new entry. Hit Add button. Type "*.exch0xx.your_server.net" in the Log on to field. Enter your primary email address as a username and your mailbox password. Credential type should be set to "Windows Logon Credential".
      For Windows 7: you will need to add a new entry. Use "Add Windows Credentials" link in the top of the list. Type  "*.exch0xx.your_server.net" in the Internet or Network Address field. Enter your primary email address as a User Name and your mailbox password.
12. Verify all settings and click OK
13. Reboot the computer.

 **Note: Only one account/password can be saved per Windows Profile**
 
If you are missing the Add button you may want to modify Windows Registry to save the password. Note, that for editing Windows Registry administrator rights are required, because it is not safe and you will perform it on your own risk.

1. In Windows, click the Start Menu > Run > Type in "regedit"
2. Navigate to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Lsa\
3. Find DisableDomainCreds entry. Value of 1 (enabled) will prevent you from saving new credentials. 
   Change the value to 0 and reboot. You should have the Add button. Note, that the value of 0 is the default value.
4. Also check LmCompatibilityLevel entry. It should be set to 3, which is a default value. If you have another value, change it to 3. If it does not work with 3 then also try it with 2.
5. Reboot the computer to apply changes.
    

Also note that the new outlook profile helper will allow you to save your password without doing any of the above changes.