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)