Use ArcGIS Server Internet Services hosted by e.g. Esri |
  
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Use ArcGIS Server Internet Services hosted by e.g. Esri |
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Use ArcGIS Server Internet Services hosted by e.g. Esri as base data layers if you do not have this base data available in your company.
If you want to implement WebOffice 10 R3 projects on a national (e.g. area of interest is Austria or Germany) or international level (e.g. area of interest is Europe or worldwide) without being able to provide geographic base data, then using ArcGIS Server Internet Services as base data layer hosted by Esri are a good choice.
Anyway, too add your own specific geodata, you should use the same geographic coordinate system/projection like that used for the ArcGIS Server Internet Services, i.e. use WGS84 or Web Mercator (Auxiliary Sphere) in your ArcMap document as geographic coordinate system/projection.
Note that ArcGIS Server Internet Services hosted by Esri do not contain very detailed information, the available level of details is limited.
Go to http://www.esri.com/software/arcgis/arcgisonline/index.html for information on available services and fees (part of the services are free for use, part of them need to be licensed and paid).