We are getting frequent application event log error entries....ID 12800 Source: MSExchangeIS. they are occuring every couple minutes. and while exchange for the most part is working fine (although we do have a number of complaints about it losing connectivity and searching for the server) i am wondering what is truly causing this. i have searched the web but found nothing that seems to apply. i am running exchng 2k on a win 2k3 server with 3gig RAM. any thoughts would be appreciated.