Insert two newline after some pattern

Hi,

I need to insert two newline characters after matching of a pattern in each line of a file.

Eg. If i have a file with contents as follows:-

Now, i want output as follows :-

i.e., I need to insert two newline characters after the occurance of pattern "</Message>>".

Thnx in advance.

sed '/<\/Message>>/G;G;' infile