I reverted one of my computers from Windows 10 back to Windows 7. I did however do this during the 30 day trial Period. MS allowed you 30 day to try Windows 10 and if you didn't like it for any reason you could revert back to the original Version of Windows you were running. Click on this link for instructions: Reverting Back to Old (Win7 or Win8.1) Operating system

Thanks for the link. We knew about the 30 day trial too. But thanks again. I was on Microsoft site, asking about Mail, Cortana, Calendar. 5,538 people were asking about the same issues.

what mail do you use? Cortana can be turned off or on, or hidden from taskbar, did you know that?

Sorry Totally misunderstood/misread your question/problem. Thought you just wanted to remove Windows 10.

I've been asked what mail app I use. I can't tell you, I can't find out what it is. the app won't open. I used email address from my service provider. Set up over a year ago, too old to remember what app name was. I didn't turn off or hide Cortana, the gray space is there, the icon is gone, I didn't change anything with it. Mail, Calendar and Cortana just don't open.

Thanks for the help. If I remove my mail, calendar app, it will also remove my husbands. His is working again since I restored back to Win8.1 this morning. His mail app wasn't downloading his mail, no mail for 17 days.

This brings up new questions. Mikie gw, if I use your command prompt, and remove both our mail apps, how do I set them up again? Maybe they weren't done right the first time, although we had no problems until 10 was installed.

What is the character between asterisk and remove-appxpackage? Letter L lowercase? or straight up bar on backslash key?

Pipe key -- except vertical -- on my laptop its directly above the right side of the Enter key, or = Shift + \backslash.

due to slow performance, repeated rebooting, I was forced to revert to Win7.

However, Win10 did notify me that I would need to reinstall 15 applications. They were right.

So, be careful. Make sure you have original cd's or at least the ability to reinstall from an online source.

I'm assuming you've either turned off something that all three needed to run or never turned it on. I assume since you said it ran before that you've turned something off. Cortana requires certain information and maybe your not willing to share it with her, so you've said no to something to makes her work correctly.

To turn Cortana on in Windows 10:

1. On your Windows 10 PC or tablet, go to the search box—it’s in the Windows Taskbar, just to the right of the new Start button.
2. When prompted to get started with Cortana, select I’m in.
3. When prompted to let Microsoft use your info, select I agree.
4. When prompted to turn on speech, inking, and typing personalization, select Yes.
5. When Cortana asks what she should call you, enter your name or nickname, and then select Use that.

Win10 installed 8 Aug. Mail, Cortana, Calendar worked until 18 Aug. No, I had Cortana working, went thru the steps to recognize my voice. All 3 quit 10 days after install of 10. The strange thing was, my mail app just wouldn't open, my husbands would not download mail. His now works fine after removing 10. Mine still doesn't work. I've asked the same question on Microsoft site, have not gotten an answer.

If I uninstall Mail app, will I be able to reinstall it from Microsoft Store? Or another location? I don't have original cd's of os.

mikie gw, is this the question you answered? I'm getting confused reading these replies. Thanks for the help. I've written down your reply from above.

yes carolssis ... if you still have win 10 the standard windows mail & calendar app can be uninstalled and then from the store installed again with those commands I wrote earlier .... and the | is the pipe key above Enter key , a shifted \backslash.

I got a call from Microsoft today. Since I had already removed Win10 the question my husband had called about was resolved. My Mail app still isn't working, so the tech set up a remote session. Funny, he went to command prompt, admin, and typed in the exact same instructions as above that mikie_gw gave me. Then he went off to "research" with his supervisor. After 2 1/2 hours, I cancelled the session, problem still not resolved. Just my crazy way of thinking, shouldn't the command take out the mail app, then reinstall it? If you "get" the app, then remove it, wouldn't you then be removing the problem one right along with the just "get" one? Or is my thinking faulty? I'm so frustrated with fighting with a machine that I don't understand enough to do the things I need to resolve the problems on my own. I'm ready to cry. Thanks for the help kids...

The command Mikie mentions removes the "Mail and Calendar" application.

You add it back by opening up the "Store" application.

Once open you can type "Mail" into the search box and you should see "Mail and Calendar" in the drop down, like this:

Selecting "Mail and Calendar" will get you here:

mikie_gw and chuggerguy, I value your input so much. My hubby is stalling on me removing mail app as his is working fine now that 10 is gone. I hesitate also. Since I know from past experience with Windows, is there another work around?? What if I removed myself as a user, reboot and add me as a user again? Hubby seems to think that mail app is okay if his is working fine now. So, I wonder... Any ideas? Advice? Or should I just pull the trigger on removal of mail app?

Just a question...

(1) Are your and your husband's account on the same computer, or separate computers?

(2) If so, the computer is back to 8.1 now?

(3) Your husbands mail opens and works fine?

(4) You have the mail shortcut to click, but clicking it results in the app not coming up?

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Just thoughts, I'm not a tech...

Maybe instead of doing

get-appxpackage -AllUsers *microsoft.windowscommunicationsapps* | remove-appxpackage

and possibly removing your husband's working mail, you could do

get-appxpackage *microsoft.windowscommunicationsapps* | remove-appxpackage

to remove only your own? (notice the lack of the AllUsers switch)

Don't take my word on that, I may be wrong, wait for someone else, I don't run Windows enough to know my way around.

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My thought on removing your account, rebooting and adding it again...

Might work but I'd probably not be in a hurry to delete my account. Instead, I'd add a second account, switch to it and see if I could get mail working in it. Then I'd make a decision whether to delete the first account or not. That's just me though, and remember, I'm really a Windows user. Just giving you something to consider until someone more qualified comes along. :)

Do you login to windows with your email account ?

You can change your account from the email login to a local named account.. without the email connection. Then after a couple of Restarts... change it back to Microsoft email login. That's one method that can repair some mail problems that the Microsoft support team has in their manuals.

Yes, we use the same computer. We are back to Win 8.1. I log on with my local email account on screen. My mail app does not open. My neighbor came to help. She changed my email address, but we did not connect it to my service provider. Now, I don't know where to go to change it back to the one I had, that is used by my service provider. Since the mail app doesn't open, I have no idea what to do. I'll check in User accounts. See what I can find. Or try the suggestion of Name, email, password, etc. User account to see if I can make it work that way. Thanks, I wouldn't have thought of that. I hope I answered all the questions. :)

Yea! I'm up and running. I created a new "me" and computer immediately installed 3 apps. People, Mail and Calendar. Yippee! Thanks for all your help and patience. I couldn't have done it without you. I used pc setting to create the new account. Silly me, I was so used to XP and Vista, user accounts in control panel. hard to change after all those years.

Great to hear and congratulations.

I know what you mean about things being in different places. I think what I do, whether it's a new OS or a new program, is "go exploring". Basically trying to become a little familiar with where things are located, and what new things and settings are available. Just in case I need them some day. That's just me though.