Mary Jo Foley was the first to report a while back that Microsoft would be providing updates to the core apps in Windows 8. Specifically the calendar, mail and people apps would be receiving updates. A short while ago Microsoft took to the Windows Blog to let everyone know that these much needed updates will be available tomorrow in the Windows Store.
The updates provide both UI and functional changes. If you’d like to get the full story before tomorrow head on over to the Windows Blog here to get the full details.
Source: Windows Blog