Exchange Online limits

Settings and overrides named on this page

Registry values, policies and cmdlets the source mentions, with the dated steps that name them. Read the source for the values to set.

• MaxAttachmentSize
• MaxRequestSize
• MaxSendSize
• MS-Exchange-Inbox-Rules-Loop
• MS-Exchange-Transport-Rules-Loop
• Remove-Mailbox

Relative periods

Counted from an event the source describes, such as installing an update; they are not calendar dates.

• within 30 daysRetention limitsException
  Remove-Mailbox

Requirements, exceptions and scope

• GuidanceScopeRecommendation1 condition3 passages
• Capacity alertsRequirement1 condition1 passage
• Distribution group limitsRequirementScope2 conditions2 passages
• Distribution group limits across standalone optionsScope1 passage
• Hold limitsScopeRecommendation1 passage
• Journal, transport, and inbox rule limitsExceptionScope4 conditions5 passages
  MS-Exchange-Inbox-Rules-LoopMS-Exchange-Transport-Rules-Loop
• Mailbox folder limitsRequirementExceptionScope4 conditions2 passages
• Mailbox folder limits across standalone plansScope3 conditions1 passage
• Storage limitsRequirementExceptionRecommendation11 conditions1 passage
• Storage limits across standalone plansRequirementException8 conditions1 passage
• Message limitsRequirementScope1 condition2 passages
  MaxAttachmentSizeMaxSendSizeMaxRequestSize
• Message limits across standalone optionsException1 condition1 passage
• Receiving limitsScope1 passage
• Sending limitsExceptionScopeRecommendation5 conditions4 passages
• Sending and receiving meeting invite limitsException2 conditions1 passage

Extracted automatically from Microsoft's wording. Confirm dates, conditions and whether they apply to you in the source before acting; a month or quarter is a window, not a day.