iMessage will likely never be cross-platform. Apple sees the writing on the wall, only ~10% of their userbase gets the fully integrated iOS/Mac experience, and

iMessage will likely never be cross-platform. Apple sees the writing on the wall, only ~10% of their userbase gets the fully integrated iOS/Mac experience, and they know they can't leave the remainder out in the cold wrt accessing their own files (hence iCloud being web accesible). Yet you won't see Airdrop, proper Time Capsule support or other core features that don't make Apple recurring revenue add support for Windows, Android or Linux. Apple has been selective about what they're willing to do on other platforms, and its whatever they think they need to do to ensure their 1 billion iOS users are somewhat happy, while not letting their Mac sales lag (by letting the moat disappear).