By default, Office Communicator 2007 R2 enable users to set their presence to one of the following five states:
But Administrators can provide users with another option for setting their presence: Appear Offline. When a user selects this option, he or she appears to be offline. In fact, all of the user’s contacts see a presence icon indicating the user is offline.
For the users to have the option of "Appear Offline" you must create a new registry key and registry value on the computer running Office Communicator 2007 R2. For this option that I'm showing is per user or machine setting only, not a Global Setting.
Caution:
Incorrectly editing the registry may severely damage your system. Before making changes to the registry, you should back up any valued data on the computer.
Enable User to Appear Offline:
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Log on to a computer that is running Office Communicator.
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Click Start, and then click Run.
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In the Run dialog box, type regedit, and then press ENTER.
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In Registry Editor, expand HKEY_LOCAL_MACHINE, expand Software, expand Policies, expand Microsoft, click Communicator.
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Right-click the Communicator registry key, point to New, and then click DWORD (32-bit) Value.
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After the new value is created, type EnableAppearOffline to rename the value.
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Double-click the new EnableAppearOffline registry value.
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In the Edit DWORD (32-bit) Value dialog box, type 1 in the Value data box, and then click OK.
Registry Setting Sample - After making above change, exit from Office Communicator (from system tray) and relaunch it.
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After signing back to Office Communicator you should able to see "Appear Offline" on the option of the Office Communicator.
Update:
Enabling User to Appear Offline on Microsoft Lync 2010
For questions email me: mikhail@mimanu.com