Just received this unsolicited email.
Immediate Action Required: ADA Token Migration
Dear,
As part of the recent CHANG Hard Fork, we are migrating from v1 $ADA tokens to v2 $ADA tokens. To continue using your tokens without any interruptions, please complete the migration process using our ADA Token Migration Assistant.
The domain is a hospitality focused app developer, with no link to Cardano or any other blockchain. I’ve edit the “campaign” links to fail.
Take care out there.
Hello @gjlite
Thanks for heads up. 
I know you said you made the links fail, but can you remove them anyways so their website zenc43f doesn’t get ranked or connected to here via domain search.
Good point. Ive removed them.
Thanks for flagging. It is also worth mentioning that every Cardano upgrade (aka hard fork) has always been backwards compatible.
Of course not with newly added features but you could always send ada from old addresses to newer ones. Even the super old Byron addresses.
Just received the following scam email:
Its a scam. There is no need to upgrade.
It’s not an “upgrade”, it’s a migration.
They migrate your ₳ from your wallet to their wallet.
Is it too late to migrate my $ADA?
This is a SCAM dude. Your $ADA is fine.
Maybe add “SCAM” to the title of this post, just to make it clear.
Yikes, that one is no good at all. We need to amp up the contribution on the scams. There’s certainly many more. 