Error while executing web part: System.MissingMethodException: Method not found: 'Boolean Microsoft.Office.Server.Utilities.ParsedCamlQuery.HasMultipleLookupIdInClauses()'

Yesterday we got a very strange behavior in one of our customers’ SharePoint (SharePoint Server 2010) that after installing Service Pack 2 for SharePoint Server 2010, all the users started getting the below error, when accessing any library even on Central Administration site! Unable to display this Web Part. To troubleshoot the problem, open this Web…

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Lync/Skype presence status on SharePoint is not showing or not correct!

One of our customers was having a problem with his Skype/Lync presence status on SharePoint not displaying correctly. For instance, it was showing a user as ‘Busy’ whilst he is ‘Available’. In order to investigate this issue, we need first to understand how Skype/Lync presence status is working. Briefly, this feature relies on the IE…

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