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http://trac.adiumx.com/wiki/FileTransfer
Why is MSN file transfer so slow? ¶
MSN file transfers in the protocol supported by libpurple go through the Microsoft server. They are therefore very reliable but also quite slow. MSN7 and other MSN clients support a direct person-to-person transfer as is used in AIM, which is not yet supported by libpurple.
The libpurple developers are working on supporting a much newer version (P14) of the MSN protocol. This will include support for direct file transfers. We don't know when this will make it into an Adium release.