Since Windows 10 update 2004 loaded onto my PC, outlook 2010 will not store passwords for POP and Imap email accounts. I have to re-enter after every reboot. The password is cleared from the account settings user info page. On starting outlook it prompts for each password. I then have to go into account settings to set them there else I would have to re-input every time I restart outlook never mind the reboot. It would seem the the update also cleared any cached passwords to other websites as well. Those I have restored OK.
Remember password is set in the account settings, I've tried creating a new profile, I've disabled all addins. Now run out of ideas!