Original User: rlwatson
In 10.1, ArcGIS Server is 64 bit only.
I would very surprised to see a 64 bit version of ArcMap in the 10.1 timeframe. One alternative is to use the new runtime.
The ArcObject libraries are classified with regards to availability in Engine, Desktop, and Server. Server is very much a subset of that which is available in Desktop. The implication here is that, IMHO, only libraries required by Server will have 64 bit version in the 10.1 release.