Sometimes our exchange 2003 session is frozen. It occurred three times in last month. I find event 5007 error in event viewer “An error occurred during the message tracking decode operation.” I want to whether this error is the main reason.

Then what you do to resolve this issue. Do you see normal when reboot or rstart information store service. What about resource utilization in server during the freeze.Anil MCC 2011,ITIL V3,MCSA 2003,MCTS 2010, My Blog : http://messagingschool.wordpress.com

See this, seems to be the most relevant reason as it happens once in a while - http://support.microsoft.com/kb/555435Sukh

HI This issue occurs when something has a lock on the message tracking logs and we are unable to write to them. http://support.microsoft.com/default.aspx?scid=kb;EN-US;832037

This KB is useful to my situation.