versions versions versions !

Run on PS: GCM exsetup | %{$_.Fileversioninfo}

then follow

http://support.microsoft.com/kb/158530
http://technet.microsoft.com/en-us/library/bb232170(EXCHG.80).aspx

Outlook 2003: E-mail messages take a long time to send and receive when you use an Exchange 2010 mailbox

This problem occurs because Exchange Server 2010 does not issue UDP notifications to Outlook 2003. Therefore, Outlook 2003 cannot register to receive UDP notifications from Exchange Server 2010. Additionally, Outlook 2003 is not notified about changes that are made to a folder until Outlook 2003 polls the server for these changes. The default polling interval for Outlook 2003 is about 60 seconds. This is why you see delays that last approximately 1 minute in these folder actions

http://support.microsoft.com/default.aspx?scid=kb;en-us;2009942

Latest Exchnage Updates

Exchange 2010: Update Rollup 2 for Exchange Server 2010 (KB979611) Release Date: February 18, 2010 Update Rollup 2 for Exchange Server 2010 resolves issues that were found in Exchange Server 2010 since the software was released. This update rollup is highly recommended for all Exchange Server 2010 customers. For a list of changes that are included in this update rollup, see KB979611. This is a cumulative update rollup and replaces the following:  KB976573 Update Rollup 1 for Exchange Server 2010 (KB976573)

Exchange 2007: Update Rollup 2 for Microsoft Exchange Server 2007 Service Pack 2 (972076) Release Date: January 21, 2010 For a list of changes that are included in this update rollup, see KB972076. This update rollup does not apply to Exchange Server 2007 Release To Manufacturing (RTM) or Exchange Server 2007 Service Pack 1 (SP1). For a list of update rollups applicable to Exchange Server 2007 RTM or Exchange Server 2007 SP1, refer to the Knowledge Base article KB937052. This is a cumulative update rollup and replaces the following:  KB971534 Update Rollup 1 for Exchange Server 2007 Service Pack 2 (KB971534

Helpful Notes: ·        For detailed steps about how to install update rollups on a clustered mailbox server in Exchange 2007, see the following: o   How to Install Update Rollups in a CCR Environment o   How to Install Update Rollups in a Single Copy Cluster ·        For detailed steps about how to install update rollups on Exchange 2010 on DAG server, see the following: o   Installing Exchange 2010 rollups on DAG servers ·        Installing Exchange 2007 & 2010 rollups on servers that don't have Internet access