kea21! I also have the same issues using the built in email client on Windows 10. For me, I can get Verizon email to come in cleanly on the new Win10 email client however gmail has to be access for opening a browser page and navigating in. FYI, you do know that Hotmail is owned by Microsoft so it better work flawlessly otherwise think of the embarrassment for MS. Besides Hotmail, they also own "live". I can get both gmail and Verizon mail to work by turning off the router firewall however this workaround opens up worse issues for me. Keep us posted as I would be interested in hearing what MS plans on resolving your issues. BTW, the new built in email client is average...no ability to create folders, no cut and paste using snippet (nice utility but what's the point of having MS snippet if you cannot get it to work with mail?...duh?)