• Sum exact nonnegative per-account email counts and report account count, total messages, and arithmetic mean.
• Apply the same explicit rule consistently during ingest, quality control, reporting, or preservation planning.
• Expose records that need human review without silently rewriting the source data.

The total remains an exact JavaScript safe integer; the average may be fractional.

• Counts must use the same deduplication and message/thread definition across accounts, and overlapping exports must be removed before summation.
• Preserve the original value and record the rule version when using this result in an archival workflow.

• Annual Report Output Metrics Rollup Aggregator

  Use Annual Report Output Metrics Rollup Aggregator to aggregate periodic archival-program metrics into count, total, arithmetic mean, minimum, and maximum for annual reporting. Choose this tool when you need to sum exact nonnegative per-account email counts and report account count, total messages, and arithmetic mean.

• Duplicate File Hash Set Deduplication Savings MB

  Use Duplicate File Hash Set Deduplication Savings MB to calculate hash-deduplication storage savings in megabytes and as a percentage of the original payload. Choose this tool when you need to sum exact nonnegative per-account email counts and report account count, total messages, and arithmetic mean.