I guess this is something of a public service announcement - utilizing an article by the CBC:
DAYLIGHT TIME CHANGE BRINGS MINI Y2K TO COMPUTERS
For three weeks this March and April, Microsoft Corp. warns that users of its calendar programs in Canada and the U.S. "should view any appointments ... as suspect until they communicate with all meeting invitees."
See also Inc.com's: Y2K Redux? Daylight-Saving Time Could Wreak Havoc on Businesses