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The reference links are as follows:

Https://docs.microsoft.com/zh-cn/skypeforbusiness/deploy/im-and-presence/enable-or-disable-offline-im

Https://docs.microsoft.com/en-us/powershell/module/skype/Set-CsClientPolicy?view=skype-ps

Offline IM is a client-side feature of the built-in Skype business client (2016 C2R builds 16.0.6701.1000 or later) that uses Exchange Web Services (EWS) to send messages from the business client Skype to the user's Exchange mailbox.

Offline IM uses Exchange Web Services (EWS) to send offline messages from the business client Skype to the recipient's mailbox. The EWS must be available to the business client Skype for messages sent offline.

First, enable offline instant messaging (IM) for Skype For Business For Server 2015

1. Open the Skype For Business For Server 2015 Management Shell.

Run the following command to enable offline IM.

Set-CsImConfiguration-EnableOfflineIM $True

After enabling, the screenshot is as follows:

Integration of offline IM and Exchange

1. Set the DisableSavingIM and EnableIMAutoArchiving attribute values of the client policy to True. In the actual environment, you can create a new client policy and assign it to specific users. Currently, there is no separate client policy, so you can set it for the global policy.

The parameters are described as follows:

2. Make sure you update to the latest server version

3. The client must be skype for business 2016, but not skype for business 2015.

4. The test results are as follows: send a reminder to those who are not online that XXX is offline. Receiving your instant message will be regarded as a missed message, and the other party will receive the message when it is online.

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