cool, thanks for the quick reply

Is it possible and completely safe to send coins from a Qt client that is waaayy behind (and which I don't want to run for weeks to catch up)
to another address managed by the MultiBit client?

I guess so, but I just want to be sure.



To get to the matter itself, is it true that one can always transfer what's known to the network to belong to a particular address?
So even having an old wallet, i.e. a client that thinks it can spend 0.8 coins, while in reality it can only spend 0.6 anymore because 0.2 have been spend before from elsewhere (another client) but aren't recorded in the outdated client.
So even in this situation, it should always work to transfer 0.1, while 0.7 would then fail without doing harm?

Hmm, I come to the conclusion that the difference comes from the fact that there's a fee for both buying and selling, though the fee only shows up in the history for bought bitcoins and for the sold ones the 0.06% are quietly subtracted.

Hmm, could you please explain?
I'd simply calculate it like that:
1.)
6,70 BTC * 87.8 = 588.412 €

2.)
588,412 € / 86.8 = 6,772 BTC

3.)
6,772 BTC * (1 - 0.006) = 6.731 BTC

But contrary to that, my balance decreased to about 6.68 BTC.

Where's the mistake?

Thanks!

here's the history:
http://imgur.com/eAvk498

maybe it's hot linkable:

Hey!
I did a small trade, sold BTC for 87.8 € and later bought back at 86.89 €, so this should leave me with a small profit even considering the 0.6% fee.
Nevertheless though I lost 0.02 BTC from this trade which doesn't really make sense to me.
Am I missing something?