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"an unknown error occurred, error code 0x8000ffff" - OUTLOOK 2016

Posted on 2016-09-09
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Last Modified: 2016-09-16
Running Outlook 2016 on Windows 10. Outlook originally connected to the Office 368 link and synced up as expeted, but due to license issues, had to basically removed the installed OFFICE suite and use an ISO version and then an activation key - which worked and Word, Excel etc are all working

Outlook complains that "The MS Exchange Information service in your profile is missing required information. Modify your profile to ensure that you are using the correct MS Exchange information service"

I have been into Control Panel, Mail , Data Files. I am unable to remove the Data File which was added when it connected to the Office365 profile. It says the data file is associated with a mail account. To remove it use the E-Mail Tab. Try under that, says I must create a new data location for your data. so under Data Files click ADD.

Which when I click ADD returns  "an unknown error occurred, error code 0x8000ffff"

I could add another e-mail which was my hotmail address and this worked but I am still unable to remove the legacy OFFICE365 mailbox/data files. This is stopping me run OUTLOOK 2016 and then I need to re-connect to Office 365 as I now have an activated version of the product.

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Question by:ccfcfc
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by:Vasil Michev (MVP)
ID: 41791818
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Clark Kent earned 2000 total points
ID: 41792229
Hello Dear,

Please try this solution, it may help you to sort out the issue.

1. Open Outlook 2016
2. Click on "File" tab >> "Account settings" >> "Account settings".
Click on "Data Files" tab and from there you can add another PST..

Source: https://support.microsoft.com/en-us/kb/3143950

You can also create a new profile: http://www.msoutlookware.com/basic-tips/introduction-of-outlook-profile.html

Thanks & Regards
Clark Kent
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Author Comment

by:ccfcfc
ID: 41792526
I tried that to no avail .. I need to remove the current Office365 profile and re-add it but am unable to . Unless it is removed OUTLOOk does not start . It has been suggested I try the following. Appreciate any feedback as it sounds quite extreme, it is on a domain  :-

If this is domain machine, drop it off the domain. Use RevoUninstaller Portable to uninstall Office 2016 using the advanced option, this will remove the registry keys as well as the appdata entries. Run ccleaner for good measure if you want.

Rename the profile having the issue.and then remove the following registry keys for the user:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList  
find the user account and take note of last four digits of their key

Then goto  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileGuid and find the key which correspnds to the last four digits you took in the step above

Add the machine back the to the domain.

If the machine isn't on the domain then just do everything above without the remove from domain bit ;)
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Author Comment

by:ccfcfc
ID: 41801312
The fix was, eben if you ran all the steps to clean up the registry new data files etc, remove and re-intall was, to basically to dlete and create a new profile.
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Author Closing Comment

by:ccfcfc
ID: 41801313
Create a new profile was the fix
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