The next version of the MSN transport is undergoing heavy development these days. A few weeks ago I installed an msn-beta.jabber.no transport based on the trunk svn code to test how it is coming along. The last few days there has been added support for file transfer with the new MSN type clients (MSN 7.5 etc). Legacy support for Windows Messenger is still not working but is coming soon.
Note that the file transfer support is for receiving files at this moment, but the sending part is going to be added in a few days, maybe a couple of weeks worst case. No guarantees!
If you should choose to test the msn-beta transport this will not have the same uptime as msn.jabber.no. I svn update and patch the sources pretty often, with the subsequent restart. Last week I restarted the transport on an average twice a day. If you want to follow the development of the transport you can look into the mailing list.
Should you choose to test the msn-beta transport just go ahead, but remember when we migrate from test to production on msn.jabber.no I will not migrate the spool from msn-beta. This will result in that nicknames and roster sorting you have done will get lost. All contacts will be saved (they are saved on the MSN servers!) For those just sticking to msn.jabber.no they will get the spool upgraded.
I guess it will take perhaps a few months till file support will be added to the msn.jabber.no transport. If the support gets good enought to test it in production I will probably implement it. Even if it has not yet gotten released.
Happy testing! 🙂