The content itself comes from the BizTalk 2009 MSDN documentation, but I am posting for quick reference and in case the MSDN link changes(it is beta documentation).
To determine your version, do the following:
- From RegEdit, navigate to the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\BizTalk Server\3.0 key.
- Check the ProductVersion key and note the version number.
- Map the version number from your key to the table below:
3.0.4902.0 BizTalk Server 2004
3.0.6070.0 BizTalk Server 2004 SP1
3.0.7405.0 BizTalk Server 2004 SP2
3.5.1602.0 BizTalk Server 2006
3.6.1404.0 BizTalk Server 2006 R2
If the value of the ProductVersion key is greater than 3.6.1404.0, the version of BizTalk Server is BizTalk Server 2009.
On my machine I am running BizTalk 2009 Beta and my version is 18.104.22.168 but do remember that this is a Beta release and this version number is bound to change.