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Frequent Password Authentication Popups In Outlook
There are two possible solutions to this problem.

First, Outlook 2002 and maybe some other mail clients check for all accounts on your list at the same time rather than one at a time. If Outlook sees two different email accounts with the same domain name, it won't re-authorize for the second one, so it will fail. If you are checking two accounts with the same domain name on our server, you can either set one of the addresses as an alias of the other and only check one mailbox, or you can set the second one to use a POP server name of mail.icglink.net or mail.icglink.com to fix the problem.

Secondly, Outlook users with a single mailbox may get repeated pop-up dialogs asking for password re-submission even if their password is present and "remember" is checked. When they click "ok" mail proceeds to work even though they have supplied nothing new. When this happens, just follow these three steps or have your system administrator help you do it.

Back Up The Registry
  • Click Start, Run, Type 'regedit' (you may have to use regedt32 to change permissions) and click OK.
  • Click the pluses next to:
    • Software
    • Microsoft
  • Right click 'Protected Storage System Provider' and select 'Export'
  • Give the key a unique name that you will remember in case you need it later and save the file someplace where you can find it such as your desktop.
Change the Permissions
  • Right click 'Protected Storage System Provider' and select 'Permissions'
  • Select the user currently logged on and set 'Read' and 'Full Control' permissions to 'Allow'
  • Click 'Advanced' and select the 'Permissions' tab
  • Select the user currently logged on, make sure 'Full Control' is listed in 'Permissions' and that 'This Key' and 'Subkeys' are listed in 'Apply To'
  • Check the box for 'Replace Permission Entries on all Child Objects with Entries Shown Here that Apply to Child Objects'
  • Click 'Apply' and 'Yes' when asked if you are sure
  • Click 'Ok' and 'Ok' to return to the Registry Editor
Delete the Key
  • Click the plus next to the 'Protected Storage System Provider' key
  • Right click the user sub-key folder that looks like a long string of numbers with dashes
  • Click 'Delete' and then 'Yes' when 'Confirm Key Delete' appears
  • If an identity has a sub-key under the 'Protected Storage System Provider' key, delete all the sub-key folders, too.
  • Close the Registry and Reboot
Now just check your mail and enter the password one more time. That should take care of your problem.

For more information, see Microsoft Knowledgebase Article

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