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