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How can I report on the number of users actively using Lync in my organisation? I want to be able to find out what the uptake is.

Thought about going through our mail server, but the saved conversations don't go via SMTP. Also wondered if there's a Powershell way to get the date of the last login / last conversation.

I'm using Lync 2010 via Office 365.

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Do you have administrator rights over the Exchange/Lync server ? – mveroone Sep 27 '13 at 15:33
Yes I do. It's O365 (online) with one on-premise server. – Ben Sep 27 '13 at 15:46

It's not very impressive but for Lync Online you can use the Get-CsActiveUserReport to show the number of active users per tenant on a daily, weekly, monthly or yearly basis

It only works for Lync Online (O365) and I'm not sure how factors in users using on-premises servers

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I've used a Powershell script in the past for this sort of thing, and Pat Richard from ehloworld has a really good write up:

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