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There are three primary differences: store size limits, included connectors, and cluster support. Standard Exchange 5.5's public and private stores are limited to 16GB, whereas the Enterprise Edition provides for (theoretically) unlimited storage. Exchange 5.5 Standard includes the following connectors: Site Connector, Microsoft Mail Connector, cc:Mail Connector, Microsoft Notes Connector, Internet Mail Service, and the Internet News Connector. Enterprise includes those along with PROFS, X.400 and SNADS connectors. Finally, if you need to cluster Exchange, you need the Enterprise Edition; Standard does not support clustering.
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