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tegeniusFlag for United Kingdom of Great Britain and Northern Ireland

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Outlook stopped connecting to Exchange

I have a user running Outlook 2007 and now her client won't connect to Exchange. Access to the published application (citrix) as a backup works fine and she can ping the exchange server. I've even tried putting in the IP address instead.

I've tried deleting the mail profile and setting it up again but to no avail and system restore isn't working either.

Any thoughts?
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Carol Chisholm
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try setting the connection encryption on

Exchange settings - Security - encryption . encrypt data between outlook and microsoft exchange
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Was already ticked. Tried unticking it and still nothing :-(

Also tried logging on as new user to initiate autodiscover/config and "Microsoft Exchange is unavailable" comes up so there is clearly something stopping this machine from talking to exchange or exchange is blocking it possibly?
This issue should be solved by settting on "ask for credentials on logon" and then turn it off agian.

go to tools - account settings- Change... - more settings.. - Security - "always promt for logon credentials"

then restart outlook. then logon with domain\username and password.

Regards Aamodt
Is the date / time OK on the workstation?
Can you the account it up on another workstation?
Or in another user profile?
@ aamodt: Ticked box, no logon credentials were prompted for. No connection to server, just comes up with the cached mailbox and in the bottom right hand corner: "Disconnected"

I've tried toggling between offline mode aswell to try and prompt it to connect.

@carolchi: Good point! Never thought to check that. Unfortunately the workstation has the correct time/date/regional settings.

I've tried logging in as domain admin and setting up exchange as myself. I can ping the exchange server but it still comes up with "Microsoft Exchange is unavailable" when autoconfiguring or even configuring manually a new user.
So it's a general problem with that workstation since no Outlook user can be configured on it - is the workstation properly in the domain? Incorrect DNS settings? Stray reverse DNS entry?

Anything in the security logs on the Exchange server?
Also, be sure to check whether the KB969907 update IS installed if you run office2007 sp2.
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WORKS2011
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Check your antivirus software for blocking the port you use for mail. Many AV products block SMTP port 25 to prevent from mass mail worms.
We ended up rebuilding the machine as no solid solution could be found.