Nokia previously released a ‘minor’ upgrade for better compatibility with the Ovi Store in the last update and it was a pretty sweet add-on.  Now the second N900 update this week features a list of fixes and changes. With this one we have better compatibility with 3-branded SIM cards, Mail for Exchange now works with Microsoft Exchange Server 2003, support for Swiss keyboard layouts, and some performance and route calculation improvements for Ovi Maps.

Using a phased global rollout your update should arrive over the next few days.  Users will be notified when the update is available for download, which can be downloaded either over the air or via your PC.