Empty Distribution Groups and Office 365

During  preparation to Exchange 2010 migration to Office 365, I have come across a post that says
"Apparently the dirsync tool by default WILL NOT SYNC EMPTY distribution groups.... If your distribution group is empty it will be filtered out and wont sync. (you could manually join it with the joiner tool and after that it will sync)"
http://community.office365.com/en-us/f/148/t/21613.aspx
***Is that the case about empty distribution groups?
Also, the author is saying: "Also on syncing contacts from an AD OU make sure you have NO "-" in the OU name as having a "-" in the OU name will prevent the default settings to sync contact from it."
***I cannot confirm it anywhere else, starting with http://technet.microsoft.com/en-us/library/hh852478.aspx -
Prepare to provision users through directory synchronization to Office 365
IT-NYCAsked:
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Vasil Michev (MVP)Commented:
Havent noticed this, and it's not documented as you mentioned (which is not a guarantee). Should be easy enough to test though, if I get some free time today I'll check on it :)
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Vasil Michev (MVP)Commented:
OK, I can confirm it's not true. I created an empty DG inside a new OU named "Test-OU", all worked fine. Just make sure you have met the other requirements for syncing objects (i.e. mail/displayname/proxyaddresses etc):

http://social.technet.microsoft.com/wiki/contents/articles/19901.list-of-attributes-that-are-synced-by-the-windows-azure-active-directory-sync-tool.aspx#How_directory_synchronization_determines_what_isn_t_synced_from_the_on-premises_environment_to_Windows_Azure_AD
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IT-NYCAuthor Commented:
Great answer, quick and exact to the point!
Thanks, Vasil!
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