outlook 2010 on exchange 2003, 350k duplicate emails in SENT folder (not gmail related)

today a user presented with a problem:  when they sent one email to one internal user, that email appeared in their sent folder 356,000 times.

the user who the email was sent to, only received it once.

the environment is outlook 2010, tied via exchange to a local exchange 2003 server.  outlook is not using pop3, and is not tied to gmail (which is a common google search result for this problem)

i'm not asking how to clean it up - i'm asking for guidance on why it's happening in hopes to prevent it.

not all emails are duplicated like this, it appears to be random, but always internal to internal when it does happen.  the users can send for example, 150 emails between themselves with no problem, and all of a sudden one will start replicating itself at an enormous pace

the issue started happening after last week when we:
- upgraded exchange 2000 to exchange 2003 sp2
- upgraded all workstations from office 2003 to office 2010 home/business
   (this auto-removed the old versions and replaced with the new versions, outlook profiles migrated automatically)

so...  thoughts?
LVL 24
B HAsked:
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FDiskWizardConnect With a Mentor Commented:
Is it still happening?
Try running Outlook.exe with /Cleanreminders or /Cleanrules

They could also have client side rules.
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FDiskWizardCommented:
Were all timestamps the same?
When something really odd happens within Outlook with emails, my first thought based on experience is RULES. I would check for some crazy Outlook Rule. There IS an option to "Apply rule on messages I send"

And maybe run {Path}\Outlook.exe /Cleanrules just to be sure.


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B HAuthor Commented:
awesome idea, i'll get on that and let you know - thanks!
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B HAuthor Commented:
hmmmmmmm  no server side rules for the sending user, but it appears to be a task created by the sending user, but it looks like an email

there's no "accept" button, it really looks like an email.  of course the headers are blank since it never left the server though

now to find out how the sending user caused that to be created
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B HAuthor Commented:
hmm for what it's worth, i just ran exmerge across the sending users mailbox, searching for just SENT, matching the exact subject line day and time, with 'archive out of the source' selected... it gave up after about 5000 emails, with this in the exmerge log:

[11:18:13] Error copying message with subject 'the subject here'\Sent Items'. (MAPI_W_PARTIAL_COMPLETION)

seems like it's corrupt on the server  now?
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B HAuthor Commented:
it seems to have fired off the 356k into the sent folder all at the same time and was done with it... it's some 3rd party program that manages to-do lists or something - trying to get the user to confess to me what it is...  i think they won't tell me because they don't want me to go there and remove it - since it obviously doesn't play well with outlook 2010 :)
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FDiskWizardCommented:
yeah, sometimes it jsut pays to get on a user's PC. I had to go after one this morning because someone had something stuck in their Outbox, and it was killing my transaction logs.
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B HAuthor Commented:
hmm.  says she used a template file (OFT type) - that was created in word/outlook 2003.  hmm.

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B HAuthor Commented:
this answer is on track
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