Personal Folders Backup aftermath

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Senior Member
Outlook version
Email Account
I used to use pfbackup when I was running Outlook 2003 under XP. But it's apparently not compatible with Windows 7, so I uninstalled it. Now, every time I start Outlook I'm told that "C:\users\myname\AppData\Roaming\Microsoft\Addins\c:\Progra~2\Office11\addings\outbak.dll is not a valid Office Add-in."

Clicking "OK" on that error message once just brings it up again, though clicking on the second one ends it until I next start Outlook.

But bakup.dll is not just invalid, now, but altogether gone. So how do I end this error message?


Senior Member
Outlook version
Email Account
(I forgot to check off that I want to be e-mailed if this is answered.)


Senior Member
Outlook version
Email Account
The first time I entered the recommended string, it opened Explorer to a folder with Extend.dat, and I deleted that, but the same problem arose when I restarted Outlook. So I did it again, and it went to:
C:\Program Files (x86)\Microsoft OffCAT\en\outlook.config.xml
which is very different and did not contain an extend.dat string.

Going to Tools/Options/Other/Add-ins showed nothing that looked useful. Clicking Tools/.../COM add-ins brought up that same error message, which again had to be clicked through twice, then a list of two add-ins (Norton and Evernote).

Note that the original error message had an extra \C:\ in the middle:
Might that be a clue?


Senior Member
Outlook version
Email Account
I still have this problem. To me, the solution would seem to be resetting outlook so it would no longer look for the phantom add-in ("C:\users\myname\AppData\Roaming\Microsoft\Addins\c:\Progra~2\Office11\addins\outbak.dll). This address is obviously erroneous, as "C:\" reappears in its middle--and the Addins folder is empty, anyway.

I am about to reinstall Outlook from scratch, as I am moving my system and software to a new drive -- will this cure the problem? Or is it embedded in my Outlook.PST

Diane Poremsky

Senior Member
Outlook version
Outlook 2016 32 bit
Email Account
Office 365 Exchange
this should be the correct location - c:\Progra~2\Office11\addins\outbak.dll anyway, it's not stored in the pst, so you'll be ok.

did you ever try to edit the path in the registry? (to remove the part before the c in the center)
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