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When trying to access many personal geodatabases (pGDB) (e.g., more than 126 unique pGDBs) in ArcMap or ArcCatalog, the following error message is displayed:
"Failed to connect to database.
An underlying database error occurred. Could not start session."
This is a limitation of the Microsoft Jet Engine. See the link in the Related Information section for more information.
Convert the data to file geodatabases.