Microsoft has again re-released Rollup 8 for Exchange 2007 SP3 to address an issue in which digital signatures on files produced and signed by Microsoft will expire prematurely.
This time this is version number 3.
When you install Rollup 8-v3 for Exchange 2007 SP3 your system version number will be: 8.3.279.6
Rollup 8-v3 dla Exchange 2007 SP3 can be downloaded from:
Description of Rollup 8-v3 for Exchange 2007 SP3: