I have Two backend Exchange 2003 Servers with Symantec Client security for exchange installed on them. Suddenly from past 3-4 days One of my Backend server is performing very poorly, Things which i have noticed is. 1. Store.exe consuming 60 - 70% of CPU2. Mails are stuckup in Pending submission Queue they flow very slowly3. If the mails clear Pending submission queue they stuck up at Local Delivery and only after several hours the Queue gets cleared. The Users have to wait long to receive their mails its really annoying.. Things i have done. 1. Restarted SMTP service2. Stopped the Symantec Client Security for Exchange.3. Restarted the Information Store Service. But Still the problem occurs...Any suggestion and help will be appriciated... Thanks S G