Distribution lists stopped working

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I have a number of distribution lists on Outlook 2007. A few months ago they stopped working. I receive an "unexpected error" when I hit the send button. It does not matter if it is an old list or a newly created one. I also cannot use the + to expand the list and see the names. I also get an error: "cannot perform the requested operation. The command selected is not valid for this recipient. The operation failed." I have searched various helps and forums and found a few other people with this problem, but no satisfactory answers. I have put hours into this, as I can no longer do my job and will have to quit using Outlook, even though I [otherwise] like it. I cannot even find the threads/questions I was following before. I am desperate, even put in my product code to get help from MS, but it says my code is invalid even though I have a perfectly expensive and legit version of Office on my computer. I cannot use distribution lists at all, and even the send function doesn't always work (happened around the same time). I think these problems have to be related, but I don't know what to do. I am running Windows 7, Outlook 2007. I have installed the most recent fix and have even uninstalled and reinstalled Office in an attempt to fix the problem. It just comes back as broken as before. Any ideas??

Hal Hostetler - Print-Imaging [MVP]


Somasundaram Pandiaraj

Use the Inbox Repair Tool to repair the default outlook data file (.pst).

If the issue still persists, then try creating a new profile in Outlook, open the old .pst file in it and set it as default.

Note: Ensure to have your email account created in the new profile
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