Outlook Keeps Asking for a Password

Many Outlook users over the years have complained that Outlook keeps asking for a (network) password repeatedly. The problem is exacerbated when “Enter Network Password” pop-up message appears every 20-30 seconds - how frustrating! Even after you enter your correct user name and password the pop up keeps flashing and unfortunately, enabling the "Save Password" or "Remember Password" options do not solve the problem.

 

Two possible reasons for this problem:

• You have a corrupted Outlook profile (this is the most common)
• Your registry has incorrect Protected Storage System information (Please do *NOT* attempt this if you are inexperienced or unsure of working in the registry)

Fix your corrupted Outlook profile:

Create a new outlook profile and connect this profile to the .pst file (Microsoft Outlook Personal Folders data file that contains your contacts, emails, calendar, tasks, etc.) of your previous (corrupted) profile:

1. Create new outlook profile: http://www.howto-outlook.com/faq/newprofile.htm#create 
2. Locate the .pst file used by damaged profile: http://www.howto-outlook.com/faq/aboutpst.htm#location 
3. Configure new profile to use .pst file of old, corrupted profile. This can be done by following the given below steps (these steps are for Microsoft Outlook 2010):

1. Open Outlook.
2. File tab -> Info -> click Account Settings (Outlook 2007 Account Settings option is available in Tool menu, in Outlook 2003 and 2002 Tool -> Options).
3. E-mail tab-> click your email account. (in Outlook 2003 and 2002 Mail Setup -> Email Accounts -> View or change existing e-mail accounts - > Next)
4. In the "Account Settings" dialogue box Click "Change Folder".
5. Click New Outlook Data File-> click Office Outlook Personal Folders File-> click OK.
6. Browse and locate the .pst file of old profile-> click OK.

Resolve Your  Incorrect Registry information Problem:

Close all  programs, create a backup copy of the registry

1. Click on Start > Start Search
2. Type in Regedit and hit Enter
3. Locate the folder : HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders
4. Edit Menu > New > Expandable String Value
5. Name it AppData
6. Double-click the new entry and type in: "%userprofile%\Application Data" (without the quotes) in the "Value data field" box.
7. Click "OK" and close the registry editor.

Note: Before following this solution make sure that you have created a backup copy of registry.