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Mailbox plans

A mailbox plan is a template applied when a mailbox is created. It sets the mailbox’s size limits and which features it gets, so you configure the shape of a mailbox once rather than on every mailbox.

Every mailbox is created against a plan. Most organizations need only two or three — a standard user, perhaps a larger one for people who keep everything, and a minimal one for shared or functional mailboxes.

  • Mailbox size limits, including the thresholds at which the user is warned and then prevented from sending
  • Which mail features the mailbox gets
  • Default settings applied at creation

Exchange > Mailbox plans lists the organization’s plans. Add a plan, or open one to edit it.

The plan is selected on the create mailbox screen. Pick deliberately: changing a mailbox’s limits later means editing the mailbox itself, on its Advanced tab, which is how estates end up with per-mailbox settings nobody can account for.

Mailbox plans is one of the nine screens hidden for consumer spaces. Mailboxes in those spaces are still created against a plan — the customer simply cannot see or manage the plans themselves.