From: Art Frank on
Migrating from Exchange 2003 to 2010 in my test environment, and I'm trying
to move all public folder replicas from 2003 to 2010. One folder is stuck in
2003, and I can't get it to move. With logging turned on, I see that the
2003 server is sending out a backfill replication message (type 0x80000004)
but the 2010 server is throwing up event 1020 error. I'm seeing little bits
online about this, but typically the problems are around corrupt items or
content conversion errors. My error reads:

The store driver couldn't deliver the public folder replication message
"Folder Content Backfill Response (OCF-MAIL-IS(a)" because the
following error occurred: The duration between startTime and endTime
(4.00:30:00) of the recurrence is greater than the minimum duration between
two occurrences (1.00:00:00)..

I'm guessing that this has something to do with a recurring appointment in
the folder, but I can't figure out how to isolate which one (there are
dozens...) And really it could be something else. Suggestions?