Does OP have 1909 or 2004 or other ?
which email service is not working for OP?
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I have W10, 1909, and use Mail App for gmail, yahoo email, and ISP email. Windows Update states 'You're up to date'; received 4 updates on Sept 8 (one was for MS Office Starter 2010); and received 1 update on Sept 17.
My W10-Mail App-gmail shows received email attachment (see below), if I click on the gmail attachment below, a
save as window pops up, save file to anywhere; clicked on saved file, file opened, had to click on
enable editing in MS Word, due to file was from internet source, could work on file or whatever. Afterwards I shredded this file which was saved to desktop.
I can download & open attached files using W10 Mail App and all of these >> gmail, yahoo email, ISP email .