From Dutch site nieuws.nl:
For the first time since many centuries ago, a young white-tailed eagle is about to fledge in The Netherlands.
It hatched in early May, in Oostvaardersplassen nature reserve.
Staatsbosbeheer says this Thursday that the chick by now has grown to the size of an adult white-tailed eagle.
The animals have a wingspan of about 2.5 meter and are sometimes called flying barn doors. …
“If they have nested somewhere once, there is a big chance that they will use the same nest again next year.”
Some nests are used for decades and become very big.
The nest in Oostvaardersplassen was built this year and is 2.5 meter wide.
See also video on this page.
Update: this afternoon, according to RTL TV news, and here, the eaglet has been flying for the first time.
Dear Kitty. Some blog 
In 2007 the couple of white tailed eagles raised again a young eagle.
If you want to see the white tailed eagles the best time is to go from september untill february, the birds are not on the nest, the chance is bigger of seeing them.
You can go on you own by rental car or hire a local bird guide (www.birdsnetherlands.nl)
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Hi Falco, thanks for reacting. I myself saw a white-tailed eagle here last August; see here. Also, this blog has mentioned their 2007 breeding season.
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