Hi Guys, My name is brian, am having the following problem at a clients site; exchange system attendant servive won't start, it flags the following error;1075, dependency service does not exist or has been marked for deletion, when i check the dependencies all are present and started.pop3 and imap as well are not starting i get the following errors in the event log; ================================================== Log Name: Application Source: MSExchange POP3 service Date: 2/16/2010 4:51:40 PM Event ID: 1016 Task Category: ProcessManager Level: Error Keywords: Classic User: N/A Computer: mil-exch-01.milleradv.local Description: The worker process crashes continuously on startup: F:\exchange\ClientAccess\PopImap\Microsoft.Exchange.Pop3.exe. The service will be stopped. Event Xml: =============================================== Event ID: 1000 Task Category: (100) Level: Error Keywords: Classic User: N/A Computer: mil-exch-01.milleradv.local Description: Faulting application Microsoft.Exchange.Imap4.exe, version 8.1.393.1, time stamp 0x4a559b4f, faulting module ntdll.dll, version 6.0.6001.18000, time stamp 0x4791adec, exception code 0xc000007b, fault offset 0x00000000000b1188, process id 0x19a8, application start time 0x01caaf101e1aebea. Event Xml: ==================================================== exchange bpa is not starting as well and ther following error is logged,application failed to initialize. ================================= running services are as follows;IISAdmin MSExchangeADTopology,MSExchangeIS,MSExchangeMailboxAssistants'MSExchangeMailSubmissi on,MSExchangeServiceHost,MSExchangeTransportLog,Search,MSFTESQL-Exchange,W3Svc,IISAdmin,MSExchangeADTopology,MSExchangeFDS,MSExchangeServiceHost,W3Svc MSExchangeADTopology,MSExchangeTransport,MSExchangeTransportLogSearch. your assistance will be highly appreciated. Regards, Brian.