To add bulk user to Lync accounts navigate to the following path:
Click on Service Management link and select Users tab. Click on Add Bulk User button.
Package: Select package from the drop down list for which you want to import bulk user.
Select User: you can select one of the following options:
Create new using CSV
Lync enabled Active Directory users
CSV file to import: Browse to select a csv file.
Then click on Next button.
Send Setup Email: Check this option if you want to send emails too.
Click on Save button when done.
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