About 3 weeks ago we started noticing an increase in errors generated from Outlook. Outlook is trying to retrie data from the Microsoft Exchnage server server.domain.com. We unteamed the nic's on the exchange server it ran normally for 2 days them started generating the error again. Some users are chached some are not still get this error. Happens intermitantly throughout the day, really bad in the morning around 8 - 9 am. Looks like an RPC call error but all the things we have tried only seem to work temporarily then it degrades again. A large calendar can take 2-5 minutes to open then a few minutes later it will be fine. Server is 2003 SP1, Exchange 2003 SP2 all patches applied. We have been chacing this problem for weeks Microsoft has not been able to fix it either. Any other companies having this issue or had it and found a fix?