Just worked on a test(luckily) Exchange 2010 server with a customer. When they opened the Exchange Management Console, the Server Configuration was missing and they couldn’t change the properties of any the mailboxes. When they opened the mailbox properties they saw these little lock symbols all over the place.
When they ran the command “Get-Mailbox” in the Exchange Management Shell, they only saw a single mailbox.
So we tried all sorts of things. Then they mentioned the installed Outlook on the server and set it up to access a mailbox. Just happened to be the I tried deleting the mail profile, uninstalling Outlook, logging off and back in, no dice. Then I found out that Windows caches credentials and you have to clear those out using the below procedure:
- Open a command prompt using “Run as Administrator”
- Run the command “control keymgr.dll”
- Click “Back up vault” and follow the prompts to back everything up.
- Find and remove all credentials that have to do with Exchange or the user setup for Outlook.
After that everything returned to normal.
So if you want Outlook on an Exchange server use OWA.
Fixing IT 
thanks, we had the same problem on a exchange 2010 sp1 with a customer
That crazy thing screwed up OWA as well. Just deleting user credentials solved everything.
Thank you a lot!!!
Where am I finding and removing the credentials?
You need to run the Credential Manager as described in the last steps.
Fantastic! Thank you!! 🙂
Souci résolu grâce à cette FAQ. Merci 😉
De rien (thanks google translate)
I absolutely love you! I had a half hour heart attack and as I had been changing a few permissions as well, I couldn’t figure out what was wrong. Note to all: – don’t tick the remember password box on the server!!!
Thanks
You are a genius guy…. thanks.
You can remove the credentials from exchange by running the control keymgr.dll and select remove credentials.
Leke Fasola
Wow, great find mate. that sorted me out
Same here. Spent hours trying to figure out where I had gone wrong.
Great….Works for me..Thank you so much…
Superb Work….. Keep it up.Works for me very well. Bunch of Thanks
You made my day… Thank you
Very nice, quick fix, for me. This issue occured when I had added a new profile and selected “remember credentials” when logging in.
I had 2 other Outlook profiles on the server already.
SBS2011
Excellent info, thanks!
Saved me a few hours of headaches!
thank you
Well done, thanks!
thnx. Helped me too.
Pathetic that outlook user credentials can mess up a mail server interface.
Thanks !! this worked for me…
Thanks nice post .realy works
thx man.. omg, you saved my day 😀
Thanks for the advice. One of my techs screwed up Exchange and was going through all the roles. This fixed it.
This is still saving asses 🙂
Thanks a lot
Your solution works! Thanks a lot!
Thx, you saved me a lot of time
Thank you as well – it worked! Very helpful!!!
2019 and this just worked for me, Thank you!!
Thanks a lot ! works fine for me !