According to this post from Maidan , 537,481 people voted from home in the last election. Significantly, most were from Donetsk and Luhansk, Yanukovych strongholds.
Maidan makes the point that this flies in the face of Yanukovych's arguments that the election was void because these people could not vote. They did vote it turns out. But the other point is that this is a possible area of more voter fraud once again. The numbers are not all that large this time, but the discrepancy between the east and the west suggests something was going on.
This election though was much better than either of the previous two even with the problems. And Yuschenko won in spite of any of it. Works for me.