both our CCR cluster nodes as well as CAS servers display the following version in help / about in the exchange management console 08.01.0336.000our backup media server however shows version 08.01.0393.001all machines are running w2k8 x64 and to my knowledge they all have RU9 installed. How can I find out why there is difference in version numbers?

I would expect the official answer to be here: http://support.microsoft.com/kb/158530but it looks like this KB is sadly out of date.

aha, ok here ya go: http://technet.microsoft.com/en-us/library/bb232170.aspx------------------ The RTM version of Exchange2007 SP1 is build 08.01.0240.006, which is also represented as Version 8.1 (Build 240.6). This version information is consistently displayed in the Exchange Management Console, the Exchange Management Shell, and in the About Exchange Server 2007 Help dialog box. However, after applying SP1 to an Edge Transport server running the RTM version of Exchange2007, the version information for the Edge Transport server will not be updated in the Exchange Management Console unless the Edge Transport server is re-subscribed to the ActiveDirectory site. This is because the Edge Transport server does not directly update ActiveDirectory with any configuration information. Instead, the version information for Edge Transport servers is recorded in ActiveDirectory during the creation of an Edge Subscription. You can also determine the installed version of Exchange2007 by examining the value for each installed role in the Registry at: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\v8.0\<Role>\ConfiguredVersion ConfiguredVersion is a string value in the format of X.X.XXX.X (e.g., 8.1.240.6). 8 is the major version number. The .1 portion indicates it is SP1 (RTM would have .0). 240 is the build number, and the .0 after 240 would be .6, the minor build number. The value of the ExchangeVersion property remains unchanged in Exchange2007 SP1; the output of the Get-ExchangeServercmdlet for the ExchangeVersion parameter is 0.1 (8.0.535.0).The following table lists the build numbers that are associated with each Exchange2007 SP1 product: Product name Build number Exchange2007 SP1 08.01.0240.006 Update Rollup 1 for ExchangeServer2007Service Pack 1 8.1.263.1 Update Rollup 2 for ExchangeServer2007 Service Pack 1 8.1.278.2 Update Rollup 3 for ExchangeServer2007 Service Pack 1 8.1.291.2 Update Rollup 4 for ExchangeServer2007 Service Pack 1 8.1.311.3 Update Rollup 5 for ExchangeServer2007 Service Pack 1 8.1.336.1 Update Rollup 6 for ExchangeServer2007 Service Pack 1 8.1.340.1 Update Rollup 7 for ExchangeServer2007 Service Pack 1 8.1.359.2 Update Rollup 8 for ExchangeServer2007 Service Pack 1 8.1.375.2 Update Rollup 9 for ExchangeServer2007 Service Pack 1 8.1.293.1

I think that last version must be a typo. If the 2 were a 3 it would make more sense. Also, are you aware SP2 has been released for Exchange 2007?

ccr nodesand cas show this as configured version 8.1.240.6 in the same time both our CCR cluster nodes as well as CAS servers display the following version in help / about in the exchange management console 08.01.0336.000Get-ExchangeServer -Identity e2k7ccr | fl returns 8.0.535.0i would have thought those should be identical!?

You need to filter on admindisplayversion, so Get-ExchangeServer -Identity e2k7ccr | fl admindisplayversionAre cheking these versions in EMC help/about from the same console?

AD is only updated with the CMS' version, which is what is reported by get-exchangeserver. the actual consoles of course SHOULD be the same assumming they were updated, but I wouldn't sweat it as long as you:-upgraded both nodes-upgraded the CMS without error.

OK thanks Mike,I have previously upgraded the cluster nodes to ru9 as well as CAS, but Symantec support raised the discrepancy as an issue while trouble shooting a backup issue.

The "Media Server" only has the mgmt tools installed yes? So its not really an Exchange server. The version you are seeing there is the version of the mgmt binaries.