Outlook: IMAP - The account name is already being used. Choose another name whwn channging account option

Symptoms: 
Changing Outlook IMAP account / reconfigure or enabling "Purge deleted messages when leaving IMAP folders" failed with

"The account name is already being used. Choose another name"

Cause: 
Corrupt Outlook Profile

Solution:
Recreate Outlook Profile

Note:
There is quick way to enable "Purge deleted messages when leaving IMAP folders" using regedit (may applicable for other option) without recreate profile

HKEY_CURRENT_USER/Software\Microsoft\Windows NT\Current Version\Windows Messaging Subsystem\Profiles\Outlook\9375cff0413111d3B88A00104B2A6676 (may be different, find with multiple subkeys).

In every subkey check by double clicking "Account Name" to get readable account

create/set DWord key EnablePurgeOnSwitch value = 1

Mikrotik RB750GL failed to create backup

Symptoms:
Mikrotik RB750GL Backup gave error
echo: backup,critical error creating backup file: could not read all configuration files

and small size of .backup file

Cause:

Solution:

[admin@MikroTik] >/ip ssh regenerate-host-key
This will regenerate current SSH host keys, yes? [y/N]:
y                                       -> go with Ctrl C
[admin@MikroTik] >                      -> wait...
13:12:28 echo: ssh,critical SSH host key regenerated!
[admin@MikroTik] > 

[admin@MikroTik] >/system reboot         -> if needed