This snippet will store credentials for 2 different accounts encrypted to disk. They will then be loaded into PSCredentials as global variables. Place this in your profile for automatic loading.

PS-O365_admin_creds.ps1

New-PSDrive -Name Scripts -PSProvider FileSystem -Root <folderLocationOfScriptsGoesHere>

#read-host -AsSecureString -Prompt "Enter O365 password 1" | ConvertFrom-SecureString | set-content scripts:\O365AdminPassword1.txt
#read-host -AsSecureString -Prompt "Enter O365 password 2" | ConvertFrom-SecureString | set-content scripts:\O365AdminPassword2.txt

function Import-O365AdminCredential
{
  $smtpAddress1 = "[email protected]"
  $CredsFile1 = "Scripts:\O365AdminPassword1.txt"

  $smtpAddress2 = "[email protected]"
  $CredsFile2 = "Scripts:\O365AdminPassword2.txt"

  $password1 = get-content $CredsFile1 | ConvertTo-SecureString
  $password2 = get-content $CredsFile2 | ConvertTo-SecureString

  $global:DemoAdminCred1 = New-Object -typename System.Management.Automation.PSCredential -argumentlist "$smtpAddress1", $password1
  $global:DemoAdminCred2 = New-Object -typename System.Management.Automation.PSCredential -argumentlist "$smtpAddress2", $password2
}
Import-O365AdminCredential