() Database ”: Out of B-Tree IDs (ObjectIDs). Freed/unused B-Tree IDs may be reclaimed by performing an offline defragmentation of the database.

Details
Product: Exchange
Event ID: 621
Source: ESE
Version: 6.5.6940.0
Component: Microsoft Exchange Extensible Storage Engine
Message: <process name> (<process id>) <storage group name>Database ‘<name>‘: Out of B-Tree IDs (ObjectIDs). Freed/unused B-Tree IDs may be reclaimed by performing an offline defragmentation of the database.
   
Explanation

Too many objects were created in the database.

   
User Action

Free and unused B-Tree IDs can be reclaimed by performing an offline defragmentation of the database, so perform an offline defragmentation of the database when convenient.

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