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Error in Outlook: To free up disk space, Outlook Express can compact messages. This may take up to a few minutes.

Try resetting the compact count in the registry:

  1. Start the registry editor.
  2. Open this key:

    HKEY_CURRENT_USER\Identities\{identity}\Software\Microsoft\Outlook Express\5.0

    where identity is a string of letters, numbers, and dashes.

  3. Set the value of Compact Check Count to 0.
  4. Close the registry editor.


I tried and set up now profile in outlook however it is not working. I too test it in other computer, where was outlook set up first time. I have outlook 2010 and exchange 2007. Event viewer only shows known message: “could not complete operation one or more parameter values are not valid” interesting is if that outlook do only when i try to send to one person in our organization. to other persons all works fine. i am not able to find detailed problem message 🙁


The problem is with the cached contacts… if you delete the cached contacts or simply type the address in without using the suggested contacts or add from address list – it works. 🙂


Source: http://answers.microsoft.com/en-us/office/forum/office_2010-outlook/could-not-complete-the-operation-one-or-more/d79d2eb2-8e02-41a1-bd80-eede817e7636