Server ActiveSync doesn't work when the user's mailbox contains many  
  
calendar items. On mailboxes with a "normal" amount of calendar items no  
  
problem exists.  
  
The following event appears in the front end server application log, when  
  
trying to connect:  
  
Event 3005, Source "Server ActiveSync"  
  
Text: "Unexpected Exchange mailbox Server error: Server:  
  
[Mailboxserver.domain.com] User: [firstname.lastname@domain.com] HTTP status  
  
code: [400]. Verify that the Exchange mailbox Server is working correctly."  
  
KB842541 states that this problem has been corrected in Exchange Server 2003  
  
Service Pack 1. However I use SP1 on the front end and the back end server.  
  
I use a ISA 2000 Server for publishing the front end server to external  
  
users.  
  
Any ideas ?  
  
Thanks for answers  
  
MC

how many items are we talking? what time span are you setting?  
  
"MC" <seaedsit@hotmail.com> wrote in message  
  
news:OlRnlMlzFHA.2348@TK2MSFTNGP15.phx.gbl...

I could fix the problem now.  
  
Strange thing... It seems that it has something to do with the Kerberos  
  
ticket size. I removed the old SIDHistory attributes and removed the users  
  
from some global groups. And it works now!  
  
User accounts where the described error occured were member of about 250  
  
groups, don't ask why...  
  
MC  
  
"news" <john@1ntellisystems.net> wrote in message  
  
news:een25ZH1FHA.1040@TK2MSFTNGP14.phx.gbl...