Well, ExMerge is quite cool, but recently i had a problem with a E2K Server:
In Pre-SP1 E2K there was an Information Store created in the specific language of the client:
MailBox/Höchste HierarchieStufe/InBox....
instead of
MailBox/Top Of Informationstore/InBox....
AFAIK this was corrected/changed in SP1.
While restoring an (old grownup) Exchange MailBox info a newly setup SP3 Server everything was restored into the language dependend store. The newly SP3 was accessing the english version only.
So, the mailbox was full, but nobody was able to access it.
I tried to access it with ExMerge also, but not even the cool ExMerge was able to access it (or maybe i missed a parameter)...