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Event ID: 40 Source: LiveCommunicationsUserServices

Reached maximum subscriptions per user limit (200).
The setting referenced in contributor Ionut Marinís comment can also be changed from the LCS console in User Services Global Settings, tab Presence.
From a newsgroup post: "The setting "maximum subscriptions per user" is set to 200 by default (minimum: 10; maximum: 10, 000). You can use the LCS Management API (WMI) to change this setting to a higher value.

WMI class: MSFT_SIPESGlobalRegistrarSetting
Property: MaxSubscriptionPerUser

You could use wbemtest.exe to change the value".

See the link to "Exploring WMI with Wbemtest.exe" for details on "Wbemtest.exe".

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