With the release of Microsoft Exchange 2007 onwards, the production support is only on 64-bit platform. Reason is simple:
To scale and to sustain heavier load, you need more RAM. Bigger mailboxes also require larger addressing space.
Sun recently advises its customers, who are on Message Server x86 32-bit platform, to migrate to 64-bit platform. Similar reasons given:
- Solves the problems with large store.idx files
- Ability to run a reasonable number of imapd processes instead of running dozens of them.
- Better LDAP cache utilization
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