chief executive Paul Tuohy said: "Everyone hopes that Madeleine's disappearance will have a swift and happy ending.
therefore guarantees confidentiality to seekers and found alike.
already uses Trend Micro's ScanMail, Server Protect and OfficeScan to protect five servers and almost 100 computers within the organisation, keeping servers and files protected and scanning incoming and outgoing mail to user PCs.
receives thousands of missing persons reports every year, but on a positive note the charity helps to resolve 70 per cent of cases it works on.
But as the NMPH
points out, many people disappear just because they want to.
recognises the right to stay out of touch and can forward an `alive and well' message to put relatives' minds at rest without revealing the senders' whereabouts.
The police tend not to actively look for people except in cases of vulnerability or crime and regularly refer cases to NMPH
There is growing concern for Elizabeth's welfare and we urge her to contact us to let us know that she is OK," added the NMPH
A spokesperson for the NMPH
said: "We are greatly concerned for Kevin's welfare.
I've never been in the situation of needing the services of NMPH
but know from speaking with those waiting for news of their loved ones that the care and support received from the charity has enabled them to cope with their lives.
As volunteers and workers from the NMPH
released 500 balloons above The Mound in Edinburgh to herald the start of the walk last Thursday, another couple joined the Burns for the first leg of the trek - Derek's old school pal Ian Dickson, 34, and his wife Elizabeth.
was closely involved in the project, choosing the photos which could be used, and each image is accompanied by details of the person's disappearance.