Google says it expects to have Google Calendar up and running normally following widespread reports of an outage.Google said Thursday that users had been seeing "server error" messages when opening the app. It later said that service had been restored for some users already and it expected a resolution for all users in the near future.Exasperated users took to Twitter to voice their frustration during the outage for the popular scheduling service. One user noted that Google Calendar going down "is like a snow day for adults."