The demand for external users to connect the cube is being heard very often.

For example : Domain A users will connect to domain B cubes. After testing it with my colleges, this is the possibilities I have summarized:

1. using Threat Management Gateway (TMG) Server as a Reverse Proxy. We will also need a solid Kerberos implementation.
The process is described very well in this whitepaper; http://technet.microsoft.com/en-us/library/gg128954.aspx

2. We can use the SSAS access via http. The technique is described in this document: http://technet.microsoft.com/en-us/library/gg492140.aspx.

For any other ideas, Please comment here and elaborate !!!

Thanks.

Ronen