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Outlook 2007 (Exchange 2003) - Outbound mail is being sent under another's name

I don't even know where to begin with this.  The user has a Windows 7 (x32) system running Outlook 2007.  It is part of an Windows 2003 SBS domain (single server) with Exchange 2003.  When she tries to send email, Outlook reports that the message was sent.  The recipient never gets it.

I found from looking at the message tracker in System Manager that the Exchange server is trying to send it under someone else's username.  It is then bouncing back to that user because the original user doesn't have "send as" privs.

I've tried creating a new profile.  I tried removing and re-adding the PC to the domain.

If she uses OWA or Outlook on another PC, everything works fine.  It is only on this on PC.

Any clues?
1 Solution
Neil RussellTechnical Development LeadCommented:
You could spend a week investigating, doing virus scans, malware scans, spyware scans....

Or you could just format the machine, reinstall and be up and running by lunchtime.
Normally much quicker withh a real oddball like that, unless somebody comes up real quick saying "OH! I've seen that before"
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
What does OWA does on her PC ... i guess Outlook on her PC is trying to send with another in From field.

Check this
Start -> Run -> control keymgr.dll (check for no cached credentials)

- Rancy
crapshooterAuthor Commented:
Spot on!  There was a cached credential that was causing the problem.  All is well.

Thank you!!!!

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