OCS 2007 R2 to Lync 2013 migration – The new environment will be in a completely different forest with Lync 2013.

Hi All,
Need help - we are planning to migrate around 14000 ~ 16000 users from OCS 2007 R2 to Lync 2013 environment -
issues are - the new Lync 2013 environment will be in a new forest and sip address will not change.
Considering the same - I understand we don't have any option other than going for a cut-over.
please help me to understand how can I move the user's contact and other configurations from OCS 2007 R2 to Lync 2013. 
Thanking you
Maz 

Hi,
It is indeed a clean cut over. BIG BANG.
You export all users from your OCS environment. All scheduled live meetings will need to be rescheduled because Lync Server 2013 doesn't support Live Meetings anymore.
I would export, convert and import all users like this:
Dbimpexp.exe /hrxmlfile:"C:\Logs\Lync2010data.xml" /sqlserver:Sql.contoso.com\rtc
Convert-CsUserData -InputFile "C:\Logs\Lync2010data.xml" -OutputFile "C:\Logs\Lync2013Data.Zip" -TargetVersion Current
Import-CsUserData -PoolFqdn "atl-cs-001.litwareinc.com" -FileName "C:\Logs\Lync2013Data.Zip"
Don't use Import-CsUserData twice, but use Update-CsUserData the second time if needed.
Have fun!

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