Office 365: Directory Sync not syncing distribution groups

I've been having an issue with Office 365 Active Directory
Synchronisation Tool recently.  The requirement was to create a new
distribution group within Active Directory and have that
automatically sync across to Office 365. The issue is that we do not
run an on-premis exchange server.  This means that the required
attributes that the Directory Synchronisation tool was looking for
are not populated when creating the distribution group.  After a call to
Microsoft support I was informed that the following tags need to populated manually through AdsiEdit before the sync tool will work
pick it up correctly.  Lets assume I want to create the distribution
group maintenance@contoso.com, then the required attributes would be
as follows:

• proxyAddress: This needs to contain the following: SMTP:maintenance@contoso.com
  • Obviously replace the email address with the appropriate one that you are trying to create.
  • Importantly the SMTP must be upper case.  The primary address in the "proxyAddress" attribute must have an upper case "SMTP".  Secondary addresses, must be lower case.
• name: this needs to contain the first part of the email address before the @ sign. maintenance
• mail: this needs to be the full required email address. mainenance@contoso.com
• displayName: This needs to be the display name that you want to appear. Maintenance