What happens if you don't send your old coins to alcurex and just run the new MRC2 wallet?
Because I didn't do that and now I only have 150k coins instead of 15m.
old microCoin and new microCoin are basically different coin.
They have own network, so you can' t mess your old coin with new microCoin.
Also walletaddress first letter is different (old=1, new=m), so you can't send you old coin in new network and opposite.
You need to send your coins to alcurEX because you can't use new microCoin wallet on your computer if you have old wallet.dat and data in roaming/microCoin folder.
a) If you already start new microCoin but not changed roaming folder = just turn it off and start old client.
b) If you already delete or rename old roaming folder = rename it back to microCoin and start old client. (Don't lose you new wallet.dat if you have any new microCoins already).
c) If you already delete everything in your roaming folder= find your old microcoin wallet.dat (hope you have backup somewhere) and start old client and wait it get sync.
If you are miss any coins in your old wallet, it is not happen because of new microCoin.
I have not hear any fork issue but it is possible, Look if there is unconfirmed transactions (after your wallet is fully sync)