Some people ARE worried (of course incorrectly) that their computer will suddenly stop working. -- Just cast your minds back to the absolutely ridiculous theories that were flying around for the Y2K changes ( 1999 - 2000) -- people said Cars wouldn't start, planes would stop flying etc etc. In fact it probably was the biggest damp squid in History with those Greedy service companies and "Consultancies" such as Accenture, KPMG, Deloitte etc ripping businesses off for Astronomical amounts of money for doing basically NOTHING.
I remember some old SAP consultants who were getting paid over 2,000 USD A DAY back in 1999 for doing very little work on these "Y2K" projects.
Funnily enough IT seems to be the only business I've ever seen where with few exceptions the longer you are in it and the more experience you have the rates actually GO DOWN. !! ( Some of these same consultants are lucky now if they find SAP contracts paying 600 - 700 USD a day in 2013 -- so Go and figure that one out. Luckily Engineering is still good as modern education leaves a huge skill gap and these jobs can't be "off shored").
So some people need to be re-assured that their computers won't suddenly stop working even if Ms were to vanish overnight -- which of course it wont do.
(BTW a lot of the millennium problems were caused by people writing the YY in two digits - so was 010100 01/01/1900 or 01/01/2000. For insurance companies and Banks it would make a difference but relatively easily fixed,
The old IBM mainframes held year dates as well as two digits so people would label expiry dates on data like 99/365 for "indefinite" but then of course 00/001 would be less than the previous date so the data could be overwritten. However all these changes weren't a mega issue -- although people working for those "consultancies" I've mentioned above conned businesses into thinking it was the most complex project ever in order to justify their ludicrous huge payments).