DsQuerySitesByCost and public folder referrals

In Exchange 2010 and older, when you mount a public folder database, the Information Store service asks Active Directory for the costs from this site to every other site that contains a public folder database. This is repeated about every hour in order to pick up changes. If a client tries to access a public folder which has no replica in the local site, Exchange uses the site cost information to decide where to send the client. This means that, as with so many other features, public folder referrals will not work properly if something is wrong with AD.

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