It is recommended to use 64 bit modules when ingesting data into Microsoft Exchange. In many environments an ingest bridgehead server is used to perform the ingest, and whilst the machine (physical or virtual) may have 16 Gb or more RAM, out of memory errors may be observed from time to time if the regular, 32 bit modules are used.
To use the 64 bit modules it will be necessary to install 64 bit Outlook, and then the 64 bit modules. These modules will utilize RAM beyond the normal 2 Gb Windows process limit allow for faster and more reliable migrations to take place.

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