This is a MAPI issue and can occur in Outlook as well, so it's not specifically a Maintenance Plan issue. Is there a reason you are using Personal Folders (which is represented by the .pst)?

K. Brian Kelley

http://www.truthsolutions.com/

Author: Start to Finish Guide to SQL Server Performance Monitoring

http://www.netimpress.com/shop/product.asp?ProductID=NI-SQL1