Calendaring agent failed in message save notification with error 0x80040219

Calendaring agent failed in message save notification with error 0x80040219
Exchange 2003 SP2

I had an error message like the one above show up on the exchange server application log. I never seen this message before and was kind of alarmed at what it could be. The details in the log entry pointed out inconsistency problems with several public folders. The original cause and description of the problem that required me to go to this clients office was they said their Internet access and email (and whole network) was running slowly.

Less than half an hour after the call, I spoke with the customer. They said the problem had go away but would like to know what caused it. I dug into the logs first and saw several errors similar to:

Calendaring agent failed in message save notification with error 0x80040219 on the Exchange 2003 server.

At first it didn't click-in as to why this error would slow down everything including Internet access bu then remembered that this customer had a replica server of the exchange box off-site. That site was connected via a VPN. The error had to do with inconsistencies found in the database. Exchange will normally try to fix inconsistencies and be on its merry way - and it did. In this case however, the public folder calendar that contained the inconsistencies had to be replicated to the the other server. The public folder was large and the transfer slowed Internet access down considerably.