In both Windows Vista and Server 2008 there is now no longer a checkbox to enable TIP transaction. More information regarding a background of TIP can be found at: http://msdn2.microsoft.com/en-us/library/ms679484(VS.85).aspx.
TIP is something that Microsoft will hope to discourage due to efficiency and security problems which have led to its deprecation. Therefore not only is the user interface option gone, it is also disabled by default.
If there is a specific reason you need to allow TIP, this can be done through the registry:
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Modify the registry at your own risk.
To enable this it appears that the change must be applied directly to the registry: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSDTC\Security
By setting: NetworkDtcAccessTip to 1 rather than 0.
It is important to note that there will be no guarantee that this feature will be supported in later operating system.