De Beer had been abducted at gunpoint by four armed men on June 22 in the Afghan capital. STOCK IMAGE
Anja de Beer was recovering in the Dutch embassy in Kabul and was "doing pretty well considering the circumstances," the ministry said in a statement.
An experienced aid worker who spent more than 15 years working for UN agencies, de Beer had been posted in Kabul for several years and was working for the Swiss non-governmental organisation Helvetas when she was snatched on the streets in broad daylight.
The Dutch foreign ministry said she had managed to speak with her family already as well as with Dutch Foreign Minister Bert Koenders who said he was "relieved" to hear about her release.
"I'm happy that 81 days of uncertainty have come to an end," he said in the ministry's statement.
De Beer had been abducted at gunpoint by four armed men on June 22 in the Afghan capital.
She had previously worked with the Red Cross from 2000 to 2001 on projects to help widows and orphans in Afghanistan, the Dutch press agency ANP said.
Aid workers in Afghanistan have increasingly been casualties of a surge in militant violence in recent years.
In April the bullet-riddled bodies of five Afghan workers for Save the Children were found after they were abducted by gunmen in the strife-torn southern province of Uruzgan.
And last month a European aid worker was also captured in broad daylight in Kabul, highlighting the growing risk to humanitarian officials in the war-torn country.
A spokesperson for Helvetas confirmed the good news to the Dutch centre-left daily De Volkskrant, adding "we still don't know who abducted her and why."
Her family also confirmed news of the release to the daily, asking that she be left to recover in peace by reporters.
De Beer was kidnapped in front of the door to her office in the Taimami quarter, where other aid workers and journalists live and work.
So far no one has claimed to be behind the kidnapping.
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