tools which use outlook data keep lock on the pst which keeps outlook open.
outlook spy and similar utilities will allow you to see inside the pst.
http://www.slipstick.com/contest/listings_view.aspx - choose development
from the category drop down.
--
Diane Poremsky [MVP - Outlook]
Author, Teach Yourself Outlook 2003 in 24 Hours
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"Unsettled" wrote in message
...
Ok, thanks for the link - we can use that as a baseline for this
discussion.

What I'm after is: "Cause #4: Using a program that access the pst or ost
data."

I will definitely verify exactly what is running next time I get a call
about this, but I'm quite skeptical that it's some other program accessing
the PST.

So I read: "Restarting Outlook (after verifying it closed completely in
Task manager) may allow the mail to send"

Yes, that has seemed to do it sometimes. But what is the technical reason
why it even does this? My theory it that there some sort of lock within
the PST on that file that doesn't get released. Better yet, what tools are
out there to figure out what goes on within a PST? I'm not talking about
the pstscan tool, but some sort of utility to browse through it. I suspect
there isn't one?



Diane Poremsky [MVP] wrote:
http://www.slipstick.com/problems/nosend.htm