Add Support for Multiple Domains for federation with O365

Hi,

I've done this many times and there really isn't a long out-of-service period, maybe 1 minute or so.

# Connect to Office 365
Connect-MsolService

# Tell to Office 365 what ADFS server to use. Must be the primary ADFS Server if using Windows Internal DB
Set-MsolADFSContext -Computer <PrimaryADFSServer>

# Convert domain to standard without converting users.
Convert-MsolDomainToStandard -DomainName <yourdomain> -PasswordFile pwd.txt -SkipUserConversion $true
# Convert domain back to federated
Convert-MsolDomainToFederated -DomainName <yourdomain> -SupportMultipleDomain

# In secondary ADFS servers, restart ADFS service to update the config data
Restart-Service ADFSSrv