I have CallManger 4.0 and Unity 4.0 both on W2k servers. I'm sure the answer is another conversation somewhere, but buried so here it is again.
Since the boxes are w2k can I just use the TZEdit tool from Microsoft to adjust the DST dates without any additional patching or negative concequences?
Although it might work, I would recommend following the Cisco guidelines for updating these boxes for the sake of stability and TAC support.
Unity and DST
Callmanager and DST
Hope this helps. If so, please rate the post.