We have all been living with the Mailbox in the IBM Notes client but because I work with lots of different clients I rarely use my own id. Therefore my main mail client has been iNotes / IPhone mail thru Traveler / Verse iPhone app. But when I upgraded my machine to Windows 10 and the Traveler server to the latest version I found that it works great to use the Traveler mail with the Windows 10 built in mail and calendar client.
Yes it’s a bit limited, mostly that you can only have one email open at a time. You can’t use Outlook because that client is blocked on the Traveler server, probably because some advanced communication that the Outlook client uses. Hopefully they will release that support at IBM Connect this month.
So if you haven’t tried it yet and have a Traveler version that supports the Verse client you can try it you self. Feel free to make a comment on you experience and use of other clients against the Domino server.