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Some time ago I wrote a blogpost about how to use the CrossListQueryInfo and CrossListQueryCache to be able to find any item within a site within a very small amount of time. Hower, since today I know that this method cant be used when you are trying to retrieve items that contain a MultiLookupField...
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For a long time I didnt know how to retrieve a login name from a SPUser field in a SharePoint List. When a user doesn't have a userProfile, he is stored in the SPUser field as <number>;#<Domain\loginName>, and when he does have a profile, his name is stored as <number>;#<name...