As the subject says... We're using Exchange 2007 and (mostly) Outlook 2003 and have a limit of 20MB. For larger files, we have an ftp server that people inside can easily copy files to or from, and we have an account on that server that we can give out to outsiders to use to upload or download files. The ftp server is an old NAS box that didn't work well, so it's got nothing else on it, the passwords get changed frequently and the files put on it are wiped every day.
I know there are services that can be used instead of having our own ftp server, I'm wondering which ones people have had good/bad experiences with.