At 9:00 PM Eastern tonight (6/22/2010) we will be installing the long awaited Exchange 2010 Rollup 4 patch which brings back the ability for PST imports through automation. Service is expected to be lightly impacted between 9:00 PM – 9:30 PM as we patch all seven servers.
Update 6/23/10: The patch rollup installation was delayed last night and moved to today. We will begin the patch process at the same time, 9:00 PM Eastern.
Update 10:47 PM: The final patch has been installed and the final reboot is commencing. Service is expected to be 100% operational by 11 PM Eastern.