SBS 2008 / Exchange 2007 / Outlook 2007-2010-2013 Authentication Prompts Solution

With several of my clients running Windows SBS 2008 within their company, I’ve been noticing a lot of situations where users are repeatedly prompted for their username and password either when opening Outlook, or every time Outlook does a send/receive. This issue seems more common on systems that are not part of the domain but does occasionally happen on domain systems too.

The solution that worked best for me was the following:

1.      Click Start, click Run, type regedit in the Open box, and then press ENTER.
2.      Locate and then click the following registry subkey: 
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\
3.      In the right pane, double-click lmcompatibilitylevel.
4.      In the Value data box, type a value of 2 or 3 that is appropriate for your environment, and then click OK.
5.      Quit Registry Editor.
6.      Restart your computer.

Setting the value to 3 worked for me.

I can’t remember the website I found this solution on but I’ve been meaning to post about it for a while now so if it’s your solution let me know and I’ll happily give credit 🙂

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