Thanks for the reply, but i really need to have it sorted soon, its the middle of the night here (Ireland!) Any one else have any suggestions ? The Mailservice error is as follows: System.IO.IOException: The device is not ready. at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy) at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy) at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options) at System.IO.StreamWriter..ctor(String path, Boolean append, Encoding encoding, Int32 bufferSize) at System.IO.StreamWriter..ctor(String path, Boolean append) at SmarterTools.SmarterMail.MailStore.Log.#Vn(List`1 , Int32 ) at SmarterTools.SmarterMail.MailStore.Log.Flush() at TcpServerLib.LDAP.LDAPServer.#nVb() at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart() Then there is a second error: Fault bucket , type 0 Event Name: CLR20r3 Response: Not available Cab Id: 0 Problem signature: P1: mailservice.exe P2: 7.6.4100.17041 P3: 4d8b7113 P4: mscorlib P5: 2.0.0.0 P6: 53a11de1 P7: 34aa P8: 9a P9: System.IO.IOException P10: Attached files: These files may be available here: C:\ProgramData\Microsoft\Windows\WER\ReportQueue\AppCrash_mailservice.exe_108dd1745ba3b343c085676940f7147b62e4a2d6_09d8c80f Analysis symbol: Rechecking for solution: 0 Report Id: c924f4e0-9600-11e4-86e6-0013726863da This occurs about a minute after the mail service starts. SM v7 (Now) and .Net 4, Win 2008 R2 Thanks, Alan