Hi,I recently migrated an instance of MS SBS 2003 standard onto new hardware but have been having problems with exchange ever since. After a reboot exchange works normally but suddenly after a day or sometimes two it slows down almost instantly to a virtual stop. Exchange 2003 clients get RPC trying to connect error and don't update and webmail takes around 10 minutes to load for 1 user. Issue is resolved by rebooting the server.New server: Dell Poweredge 2900 III. MS SBS 2033 standard1x RAID 1 Mirror System, 1x RAID 5 partition data. Exchange db on RAID5, Logs and install on RAID 155 users ~ 65 Gb exchange data. Most users in the multiple GB mailbox size.9 Blackberry's connecting via Blackberry internet service4 iPhones using exchange activesync~ 6 users connecting using outlook 2007 with RPC over HTTPS from a remote site (self certified)Trend Micro WFM advancedTried:Turning off all TCP/IP loffload settings for Broadcom network drivers. Rplacing network card with card from old working server. (Also broadcomm) Installing advanced networking MS patch.Various hardware diagnositcs with Dell.Run ExBPA:Certificate Principal MismatchRecipientUpdate Services did not process all changesVM Largest block size is low and may cause reliability issuesUpdate for daylight savings not detectedExTRA: (gives different results depending on when working and when broken - these are when broken)Disk Bottleneck foundMost in progress calls are in Virus ScanningNetwork Interface problem foundQueue performanceissue identifiedServer exhibiting high RPC Latencies or high RPC ratesSlow virus scanning callsModerate RPC user activityQuite a list! Not sure where to start? Has anyone else seen this, or can point me in the right direction?Thanks, John

While I love my iPhone, there have been some reports that they don't always play by the rule. Just a shot in the dark:iPhone Causing high RPC traffic on Exchange 2007http://social.technet.microsoft.com/Forums/en-US/exchangesvradmin/thread/95278ca8-bbba-4ffd-a137-6fd24cb50a00Jon-Alfred Smith MCTS: Messaging | MCSE: S+M

Hi,To get the professional support on the SBS 2003, please post it on the Small Business forum:http://www.microsoft.com/communities/newsgroups/default.mspxThanksAllen