Mir Hosain mousavi sent following message to all Iranian living aboroad:
Honorable Iranians living abroad,
Your widespread and energetic presence in this year’s 22 Khordad elections is indicative of your ties to our beloved Iran, and your admirable worries about the future of your country, and as I mentioned to you in my election message, Iran belongs to all Iranians and all layers of the populous are responsible for its future, and enjoy the same rights in it.
I feel obliged to thank you for your epic presence in determining the future of your country. Your widespread welcoming of these elections and your green and energetic presence at the ballot boxes was so large that it even forced the government and the organizers of the elections to admit to a 300% increase in the participation of Iranians in the tenth presidential elections outside of the country.
Unfortunately, as you witness in the international media, contrary to the letter of the constitution, and the stated freedoms in the Islamic Republic, all my communication with the people and you has been cut off, and people’s peaceful objections are being crushed. The national media which is being financed with public funds, with a revolting misrepresentation is changing the truth, and labels the peaceful march of close to three million people as anarchist, and the media that are being controlled by the government have become the mouthpiece of those who have stolen the people’s votes.
you can read Mousavi's complete message in English and French here.