The Treo communicator is based on Palm OS 3.5.2H5. Why not the later 4.1 OS like the Treo 90, Handspring had this to say, "We are currently building great communicator products on Palm OS 3.5 with Handspring's software enhancements. At this time, we don't feel that Palm OS 4.1 brings significant advantages to our communicator platform that would warrant building it into this product." "We have not incorporated OS 4.0 into our products because many of the features included in that OS are already a part of our version of OS 3.5. Handspring continues to make its own versions of the Palm OS, some of which are given back to Palm and incorporated later, and some that are only available in Handspring products."

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