Hi, I been searching hard for an answer for this issue I'm having and cannot believe I'm the only one having this issue. Hope someone out there can help me. Here we go...Microsoft Exchange Server 2003, Outlook Web Access, IE7, Vista Ultimate & Office 2007 Professional. WhenI get an email message with an office attachment (Word, Excel, etc XP, 03, 07 etc) When I try to open it directly from OWA, it will ask me for my credentials AGAIN as if I had to log into OWA one more time. I can cancel the authentication window or put in the credentials agai and the Office document WILL open either way. So the is a very strange (and very annoying) for me and my users.We are not experiencing this issuewhen usingWindows XP OS with IE7 and Office XP.This is a strange "bug" as when I open the attachment (Word, Excel ETC) from OWA, OWA will ask me to input my username and password as if I was logging into OWA again. If I cancel the log in screen, the Word document WILL OPENS right away. Crazy isn't it?! Any suggestions or fixes, would be greatly appreciated!.FYI, I did try to add our email server to IE7 "Trusted Sites" with no success AND these MS support articles DID NOT HELP either http://support.microsoft.com/kb/317901/en-us http://support.microsoft.com/kb/839948/en-us

Please tell your detailed version of exchange server, exchange 2003 SP1 or SP2? The issue appears to be by design for OWA security and may not have a true resolution Possible Solution: 1. Did you enable "Form Based Authentication", based on my finding, it will resolve the issue 2. select "save password" checkbox when you input the credentials 3. IE->Tools->internet option->"security" tab->"Custom level" button->User Authentication->"automatic logon with current user name and password"->Restart IE Workaround (it can pose some security risk): 1. Added the registry values to the "KnownContentTypes" (server) HK_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeWEB\OWA + application/msword + application/vnd.ms-excel Related KB:KnownContentTypes registry entry http://support.microsoft.com/?kbid=873138 2. Added the registry values (server) HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeWEB\OWA" a. Remove "application/octet-stream" from the Level2MIMETypes value b. Add "application/octet-stream" to the KnownContentTypes value c. restart the Microsoft Exchange System Attendant

Hi James, thanks for the info... Per your spec request... Windows 2003 Standard Edition Server SP2 Windows 2003 Exchange 6.5 SP2 I've just confirmed something though.. this does not look like an OS issue. I first thought it may be Vista and Office 2007 BUT it looks like it does the same thing running XP and Office 2007. I do not have this issue running XP and Office XP. So it looks like and Office 2007issue.. Any ideas?

Testing and found that Office 2007 with IE 7 gets prompted for documents. Testing and found that Office 2007 with IE 6 gets prompted for documents. Testing and found that Office 2003 with IE 6 doesn't get prompt for documents Based on my research, I have found that issue is by design. Yet it's not just an issue with Exchange, but an issue with opening any Office attachment where it is accessed via a URL. It may happen to Office 2003 and later version. There's related KB 838028 talks about the reasons why Office is prompting for credentials. The explanation is under the "Identifying known drawbacks that are caused by Office Protocol Discovery" section (second paragraph) Notes: It says that you can avoid the symptom by modify permission, but you won't want to do it. This would open up the mail store to all users Here's three known workaround: 1. Select the "Remember my password" checkbox whichI've told before 2. Click Cancel every time which you did every time 3. Save the file to the local hard drive, and then open the file from the local hard drive Please alsogive it a try to install the latest patch and sp for Office 2007 2007 Microsoft Office suite Service Pack 1 http://support.microsoft.com/kb/936982

Hi James, thank you for taking the time out and doing some testing on your end.. Much appreciated... I guess we're stuck with either saving it locally or cancelling the authentication box. Did I tell you that using Firefox DOES NOT trigger owa to reauthenticate?! Go figure!

Did u ever manage to resolve this issue... without workaround? I have another info 2wards this. First the attachments could be opend, but no msg writen (the text field was marked with e red cross, couldnt b displayed) after readingan ms artical, i installed KB 924334 on frontend and exchange server. This resolved the problem, combined with installing newest S/MIME direct in the Options of OWA on the Vista Client (also with Office 2007) With XP Office 2003 it works without issues... Any ideas??? Cant really accept, this is by design

No but the post by James-Luo above seems to be the resolution for atleast now. Im glad to hear that Im not the only one still having this issue.

This problem had caused me a good deal of inconvenience also and therefore thought I would post the answer if I found one. This has certainly fixed the problem for me. See articlehttp://support.microsoft.com/kb/955375Fortunately for me an MS representative located this article on the internal knowledge base as it was linked tohttp://support.microsoft.com/kb/838028. Unfortunately for us it was not on the public site.

I'm having the same issue with Exchange Enterprise 2003 SP2 on Windows Server 2003 Enterprise SP2. Clients running Windows XP SP2 and SP3 with Internet Explorer 6 & 7 and Office 2003 SP3. The issue is random as far as what users it will affect. Is it possible that upgrading to Exchange 2007 will resolve this, or is this specifically a client side issue with OS,IE and Office? Thanks, Nick

I was able to correct my continuous credential request issue by adding the exchange server under trusted sites and then customizing the security for Trusted sites to use the same username and password every time. Worked like a charm! Just wanted to say THANKS!!