Beginning with build 16.0.3331.1000 of Skype for Business 2016 client, you can now send IM messages to contacts even if they are not signed in.
This feature lets your contacts know that you have been trying to reach them. You don't have to wait until someone is online before sending them a message. And you'll no longer receive those "this message can't be delivered" notifications when you send a message to someone who is offline.
Send a message to an offline contact
When you start to send a Skype for Business message to someone who is offline, you will receive a message confirming that even though the person is offline, they will get the message.
Note: Offline messaging can be used for person-to-person conversations only.
Retrieve a missed message
See your missed messages in the conversation window
In the Skype for Business conversation window:
Double-click to open a missed conversation.
Unread messages with the conversation will be indicated by an orange dot.
Missed conversation indicators will clear automatically after the conversations have been viewed or after they've been tabbed through.
Be notified if have missed messages via Windows Alerts
Windows Alerts will let you know if you have missed messages.
Server side requirements
The csclient policy assigned to the users must have EnableIMAutoArchiving and DisableSavingIM properties both set to True. If either or both of these settings are set to False, offline IM will not be enabled. This is required so that conversation history is enabled and maintained.
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This post originally appeared on Office Support here.
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