I have a situation where there are two organizations that are going to merge into a yet to be third over time. One organization
is running Windows 2008 with a 2003 Exchange. The other organization is running Windows 2008 with Exchange 2007. The organization we want to merge them into to will be running Windows 2012 and Exchange 2013. The merging of operations will take place
over a considerable length of time and during that period we will need to keep the two 'to be merged' entities functioning as they were while moving/blending departments/users from each to the third entity. Until we are done we want all the users in
the organizations being merged to communicate with each other as if they were in the same organization - as if they had one Exchange. For external entities we want them to still communicate with the individual organizations being merged as if they were
communicating with them directly but in fact we want to filter all email through the new system - Exchange 2013 - we just want it to look like it's coming from the original organizations. Would Federation Services make this possible? If so I would appreciate
anybody who's had a similar experience to give me the benefit of their experience and/or point me to relevant documentation for this kind of scenario.
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