Meeting request failures

I am receiving error (0x80070057-00000000-00000000) when sending meeting requests.
I get the error regardless of who is included (internal or external for my Exchange server).

I have looked for rogue macro's and any malfunctioning add-ins but have had no luck.
There are no macro's installed. The one I expected to see (ShowAppointmentCreator) is not even there.
If I start Outlook in safe mode and send the meeting request it goes through without any trouble.

Aside from the typical user malfunctions all other functionality seems to be working just fine.

Does anyone have any further suggestions?

Thanks in advance!!!!
Who is Participating?
is this for a sole pc or multiple pcs? many users or just happening with one user?
are there any more details on the error message?
Try deleting and recreating your mail profile off the local computer
Also try to run FIXMAPI.exe  (it runs silently)
Mike_SumnerAuthor Commented:
I killed the profile and rebuild prior to posting the question. I had the same issue.
I then uninstalled/reinstalled Office. The problem came back with the addition of a new problem.
Now the user can not open .msg attachments. All other "safe" attachments seem to open without problems.
After the clean install I tried the FIXMAPI but that did not yield any results.
The local event logs tell me nothing and the exchange logs only reference "unable to contact user".
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Mike_SumnerAuthor Commented:
One person, one laptop. Unfortunately there seems to be nothing more on this error.
There is nothing in any of the event logs for the machine or the user.
The new issue of not opening the .msg attachments is a mystery also. Nothing in any logs that I can find.
The original and reinstalls were both complete and not upgrades.
the .msg thing sounds like a file association issue - fix this via folder options --> file types

however try recreating the local windows profile first:
login as local admin. rename the local windows user under \docs and settings\ which is having problems and then log out. log in again as the problem user so it loads the default settings. test to see if the issue still occurs in outlook.
If the issue is resolved, then copy over desktop, favourites, start menu shortcuts, outlook.nk2 and any printer settings over to the new profile.

Mike_SumnerAuthor Commented:
The file assocation was correct. It was the first thing I checked.
I did create a new profile and setup the mail account. All problems went away.
Intresting thing, I copied all of the user files but when I put the .nk2 file back both problems came back as well.

I logged back on to the old profile and nuked the .nk2 file and all of the problems went away.

Oh well, it looks as though the user will have to rebuild some of his preferences.
I would not have gotten here with out the new profile idea. I would never have thoguht of that.

Glad to hear it's all been resolved! The new windows profile usually fixes most things isolated to one machine, but copying the preferences over is just a big hassle because you may forget a thing or two.

It's the first time i've seen that the outlook.nk2 cause problems - this file only stores the email addresses that a user has typed in, (for the auto drop down quick-pick when a user starts typing an email address). Outlook will recreate a new outlook.nk2 file once the user sends a email.

In any case at least the user is up and running again!
Thank you guys,
I was able to resolve this problem by just just deleting the .NK2 file in the existing profile.  Didn't have to redo profiles or anything.  
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