This is not a virus or any other kind of malware.
Some people have been wondering about mysterious entries appearing to their
datebook to date 25 December 2030. The entries having title Santa and attached
note containing a number (usually 0).
The Santa entries are an Easter egg (a hidden functionality) in wordsmith program
versions 1.0c or older. For some reason the programmer thought it would be fun
to put mysterious entries into the datebook.
This behaviour is harmless and shouldn't cause any problems.
Blue Nomad has removed the Easter egg in the word smith version 1.0d.
[Analysis: Jarno Niemela F-Secure, January 2001]