<process name> (<process id>) Database '<name>': Background clean-up skipped pages. The database may benefit from widening the online maintenance window during off-peak hours. If this message persists, offline defragmentation may be run to remove all skipped pages from the database.
As per Microsoft: "This message indicates that an offline defragmentation of the Information Store database should be performed. Offline defragmentation should be performed on each database separately". See MSEX2K3DB for more details.
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