Hi,

Ive seen this error too. Some users report that it is caused by loss
of connectivity between the Outlook 2007 Client & The Exchange
server.

See this thread:
http://groups.google.com/group/micro...82b6ad4f64b236

There was a hot fix deployed but one user stated it didnt fix the
problem. I have my own suspicion of power management features in
laptops causing this issue. I personally havent seen the issue on my
desktop installation. But other test users have.

Hopefully this helps.

-IL