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Yes. CustomMailer 4.0 works fine on Pentium 4 systems. The first few releases of CustomMailer 3.0 (prior to Pentium 4 machines) did have a problem running on Pentium 4 systems when these first came out. This problem was fixed in the CustomMailer 3.0e release (the final 3.0 release before 4.0 was 3.0g).
