We have migrated all mailboxes from exchange 2010 to Exch 2013 but we are not able to migrate distribution groups.
We run the below command on exchange power shell.
Get-distributiongroup | Set-distributionGroup –Forceupgrade
Then we run the below command for status
Get-DistributionGroup –Identity TestDG | FL Exchangeversion
and getting the result
ExchangeVersion : 0.10 (184.108.40.206)
When we shutdown the Exchange 2010 server then mail not delivered to distribution group.