>I am having a problem with the Database maintenamce plan deleteing older files. It works for a while then it fails. We find out about it once the disk gets full. Is this a error in MSFT? I haven't been able to find anything on it in the knowledgebase. Could be looking for the wrong thing.

It's not an answer to your questin but something to consider. A while back we switched our Backup from the the Database maintenamce plan to the script by Nigel Rivett from http://www.nigelrivett.net/BackupAllDatabases.html because it allows better control over backup.