Then I updated Plaxo, and noticed that it does the same thing - and will even cross synchronise all of my dates with MSN, Google & Yahoo (well recurring appointments don't work on MSN, but they never really did, its Microsoft)
Seems like all these independent websites are synchronising with each other.
Then they will all merge
Them it will all be owned by Microsoft.
At least I don't have to worry about privacy issues - once Microsoft owns it all it will cease working.