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Title
The Operating System version must match when Emulating Exchange and when accessing offline EDB files. -
Description
The Operating system version that Recovery Manger for Exchange is installed must match that of the Exchange server where the backup was taken from at the time the backup was taken.
This is the case when using the Exchange Emulation feature and when working with offline EDB files.
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Resolution
This is due to the manner in which Unicode indices work, there are links at the bottom of this KB article which go into this in greater detail but the general idea is this:
Different versions of Windows normalize Unicode text in different ways. That means indexes built under one version of Windows may not work on other versions.
Extensible Storage Engine (ESE) uses LCMapString to build a Unicode index. LCMapString is a part of National Language Support (NLS) which helps applications to support the different language- and locale-specific needs. The result of this function may differ for different versions of the Windows Operating System. Since ESE uses LCMapString for creating a key for sorting, it means a key created for the Windows 2000 Operating System may differ from a key created for Windows XP or Windows 2003. This also means a Unicode-index created on Windows 2000 may not work correctly on Windows XP. The most likely results of using an index on the "wrong" Operating System are impossibility of sorting by using this index and incorrect insertion in tables.
Furthermore, LCMapString can return different results even on the same version of the Windows Operating System. It happens because the function behavior can be changed after a regular update or after a service pack is installed.
So the recommendation is; to avoid issues with Unicode indices, the version of the Windows Operating System should match the version of the Windows Operating System where the .edb was created including service pack level and installed updates.https://managedesent.codeplex.com/discussions/569328
http://blogs.msdn.com/b/martinc/archive/2012/09/10/introduction-to-indices.aspx
http://www.codeproject.com/Articles/52715/Extensible-Storage-Engine