windows 10 mail app

problem 1 ...... 2 email addresses wont sync i keep getting re asked for password of 2nd account.

problem 2. ..... emails that are going to my tablet or vista pc dont come to this app and when they do they mostly go straight to bulk box.

problem 3. .... as a test i sent emails to myself but sometimes i did not get them.

i am on btopenworld and gmail , i need to solve this asap because i am using the free 10 upgrade on a windows 7 pc and i am about to get a new pc so i want this problem sorted.
 
Solution
Use Windows Live Mail or Thunderbird and set your server settings to leave messages on the server for 30 days.

Good luck.