Migration from a Domino server as a source that is installed on AIX.
The uses the Notes client API's to retrieve the data and then uses the Outlook client to put the data into Exchange. Given this, as long the Notes client can log into Domino from the Windows computer (where Notes Migrator for Exchange is installed) without errors or prompts, the migration should work (as Notes Migrator for Exchange leverages the Lotus Notes Client to perform migration activities).
Another method to migrate would be to use the ‘File System’ method (SOL27457) which would require Universal Naming Convention (UNC) access to the NSF files which may or may not be possible from an AIX server depending upon the environment.