Scheduling anything in Outlook is also a problem. Shift schedules and appointments are all done in Outlook and there isn't one simple patch from Microsoft.

"They have a multitude of different patches that you have to download and it is very involved," DePinto said.

For now, changes to Outlook are being done manually at Ce De. Although there is a patch that will push out a change to all the desktops, installing it so complex that DePinto prefers to let his team update the PCs one desktop at a time.

Still, most enterprises are taking the change in stride and betting that disruptions, if they occur, will be minor, according to those interviewed by InfoWorld.

"It is not on a Y2K scale," said Ray Repic chief technical architect at Coca-Cola Enterprises. "The only item that is a bit of a pain is with our calendaring capabilities for people who have scheduled meetings out beyond March 11."