Choose a native shared mailbox when people mainly need access to one address and the ability to send from it. Choose a shared inbox application when the team also needs assignment, internal collaboration, shared status, or routing. Choose a help desk when work requires ticket records, lifecycle states, structured fields, and service-level tracking.
A team handling support@ and billing@ may begin with separate shared mailboxes. If messages then need visible owners, an unassigned queue, handoffs, or auditable status changes, a collaborative inbox or help desk is usually a better operational fit. Before connecting any system, decide where customer status is authoritative. A central inbox can be the team’s working view without being the only record: aliases, forwarding, connected channels, and CRM copies can create parallel records.
This guide focuses on selection and operational readiness rather than vendor rankings. It uses documented examples from Microsoft, Google, HubSpot, Front, and Missive, then adds proposed workflows for routing, ownership, and optional CRM synchronization. Product features, seats, limits, and plan access change, so confirm current vendor documentation before purchase.
Which shared inbox setup should you choose?
Common access and send-as
Use this when permitted users need to read the same mailbox, view its history, and reply from its address. It is not, by itself, a ticket lifecycle or SLA system.
Visible ownership and collaboration
Choose this when agents need to claim or assign conversations, add internal comments, use shared status, or route work. Feature depth varies by product and plan.
Ticket lifecycle and service goals
Choose this when the process requires ticket IDs, structured fields, controlled status transitions, and SLA goals measured against a defined policy.
These categories overlap. Decide by testing the behavior your team requires, not by assuming that “shared inbox” or “help desk” has a universal meaning. Assignment, shared visibility, and collision indicators support coordination; they do not guarantee faster replies or prevent every duplicate response.
Name the authoritative record before configuring integrations. If the inbox, ticketing system, and CRM can each change customer status, document which system wins and how the others receive updates.
Shared mailbox, shared inbox, and help desk: what changes?
A shared mailbox is an email account that multiple authorized users can access. Microsoft documents shared mailboxes for addresses such as support or reception, with permissions that can allow users to send as the mailbox or on its behalf. A distribution list, by contrast, distributes messages to members. It does not create a common work queue with shared assignment and status.
A shared inbox application adds an operational layer over connected accounts or channels. Depending on the product, that can include claiming or assignment, shared status, internal comments, routing rules, and indicators that another teammate is active. A help desk organizes service work around tickets and their lifecycle. Seeing an email in a shared conversation view does not necessarily mean it has a ticket ID, structured ticket fields, or an SLA clock.
Before moving from a distribution list, identify the address and reply-from behavior, decide which users should have access, preserve the history the team needs, and establish whether explicit assignment or ticket tracking is required. Then send test messages to confirm that one incoming message creates one intended work item rather than several copies created through forwarding or duplicate channel connections.
Google delegation is another access model, not a ticketing system. Google documents up to 1,000 delegates for work or school accounts and up to 10 delegates for personal Gmail. It recommends limiting concurrent access to about 40 users to avoid performance issues. Delegation does not inherently provide assignment states, SLA timers, collision detection, or case notes.
Compare shared inbox tools by required behavior
Shortlist products against a real work scenario. Verify supported accounts and channels, access controls, assignment, internal notes, collision awareness, routing conditions, fallback behavior, conversation or ticket states, SLA definitions, reporting, export, and integration requirements. Separate feature availability from plan, seat, account, and channel eligibility.
- Microsoft shared mailbox: Microsoft documents shared access and send-as or send-on-behalf permissions. Its current guidance states that a maximum of 25 users can access a shared mailbox simultaneously. This is not a general membership limit. Verify tenant permissions, licensing, sender identity, and whether assignment or ticket tracking is needed. See the Microsoft shared mailbox guidance.
- Google delegation: Google distinguishes Workspace work or school accounts from personal Gmail accounts. Verify account type, concurrent-use expectations, and whether delegation meets the required workflow rather than treating the delegate count as a work-queue capacity.
- Front: Front documents indicators that teammates are working on a message and real-time shared drafts. Test the handoff and reply workflow because an indicator is a coordination signal, not a formal lock. Its collision detection documentation describes the documented behavior.
- Missive: Missive documents team inboxes, assignment, and messages that may remain unassigned until claimed or assigned. Check rule scope, ordering, team membership, and the fallback for unclaimed work. Its sharing documentation explains the distinction between team and personal inboxes.
- HubSpot: HubSpot documents inbox access, routing to users or teams, collaboration, and inbox SLAs for eligible conversations associated with tickets. Product area, subscription, seats, account conditions, channel, and account age matter. Compare the documented inbox setup, routing rules, and SLA guidance with the intended setup.
Run the same scenario for every shortlisted product: a message arrives, its owner is visible, another agent can see active work, an unavailable owner has a fallback, and the team can retrieve the resulting conversation or ticket. Confirm current plan, seat, channel, integration, export, and retention details with the vendor.
Set up ownership and routing before automating
Write down queue names, accountable roles, business hours, status meanings, escalation conditions, and a fallback owner before creating rules. Start with explicit signals such as recipient address, known account owner, or assigned team. Use topic keywords or AI classification only when those fields do not settle the destination.
| Trigger | Decision and AI job | Validation and action | Human fallback |
|---|---|---|---|
| Message sent to billing@ | Route by recipient address. No AI is needed. | Confirm that the address maps to one active queue and preserves the expected reply-from identity. | Send to a named triage lead if the queue is disabled or no eligible owner is available. |
| Known customer with an account owner | Route to the matched owner or that owner’s team. Do not classify by topic first. | Require one unambiguous contact or account match and a valid owner. | Place missing or conflicting matches in an unassigned review queue. |
| Topic is uncertain | Suggest one permitted category only when explicit routing fields are insufficient. | Validate the category against an allowlist and apply the approved confidence policy before routing. | Keep the item in triage for a person to classify and route. |
The examples are proposed operating patterns, not vendor templates. HubSpot documents routing to users or teams and possible unassigned outcomes; Missive documents examples using signals such as keyword, timezone, sender, and team inbox; Front documents administrator-managed workspace rules. These products do not necessarily behave identically.
Treat collision detection as a signal, not a lock
Front documents collision indicators and shared drafts. HubSpot documents active-user indicators, typing indicators, internal comments, and reassignment in its conversations inbox. These features help agents coordinate, but they do not guarantee that two people or connected systems can never send or create duplicate work.
Set one accountable owner for each open conversation. Require a handoff when ownership changes, a closed thread reopens, the customer replies while someone is drafting, or the assigned person becomes unavailable. Before sending, the current owner checks the thread state and recent customer activity. The triage lead resolves unclear ownership rather than leaving two agents to assume the other has replied.
Connect inbox work to CRM records with a clear data contract
First confirm that the actual product and account support the required channel and write path. HubSpot documents connecting channels to Help Desk and provides default ticket properties, but that does not establish a universal API contract or a working direct integration for every inbox vendor. If you need to define CRM records and ownership, ConsultEvo’s CRM systems service is relevant.
Keep record grains separate. One conversation record represents a conversation. One message record represents an individual message. A ticket record represents a service case. A synchronization-run record represents one synchronization attempt. A reporting aggregate summarizes a defined period. Do not mix these into one event row or treat an aggregate as an individual conversation.
The following is illustrative design guidance, not a vendor schema. It shows one conversation-level record containing a representative message:
{
"source_system": "illustrative-inbox",
"source_conversation_id": "conv_4821",
"source_message_id": "msg_9017",
"source_channel": "email",
"source_received_at": "2026-10-10T14:25:00Z",
"destination_object_type": "ticket",
"destination_record_id": null,
"assignment_state": "unassigned",
"classification": "billing_question",
"classification_source": "ai_suggestion",
"rule_or_model_version": "illustrative-v1",
"human_review_status": "pending",
"last_synced_at": null
}A responsible sequence is: receive the message; retain its source IDs and timestamp; optionally suggest a label from an approved list; validate the schema, destination permission, and contact match; perform only an approved CRM or ticket action; then send failures to a CRM operations exception queue. If the contact match is ambiguous, stop the write and ask a person to resolve it. An AI label should not independently change billing, refund, access, legal, or security records.
Deduplicate at the declared grain. For one destination record per source conversation, a proposed key is source_system + source_conversation_id + destination_object_type. For one record per source message, use source_system + source_message_id. For a daily metric aggregate, include the team or inbox, metric date, timezone, channel, metric name, and aggregation period. Enforce uniqueness in the database and use a transactional upsert where supported. A lookup followed by create can race when two workers process the same event concurrently.
Set privacy, access, and service measures
Limit access to the people who need each queue. Separate sensitive HR, finance, legal, and executive communications from broadly visible support work, and review membership when staff change roles or leave. Missive warns that communications received through shared accounts may be visible to users who have access, so mailbox membership is a privacy control, not just an administrative setting.
Choose measures only after defining what they count. First human response, resolution or close time, backlog, reassignment, and SLA attainment can each be useful, but specify business hours, channel, bot-reply treatment, reopened-thread behavior, and whether the measure is per message, conversation, or ticket. HubSpot’s documented inbox SLAs concern eligible conversations associated with tickets. Confirm the current product and account conditions before relying on them.
- Two agents open the same thread and the team can identify one accountable owner.
- An agent is reassigned while drafting and the handoff and reply decision are clear.
- A customer replies after closure and the message reopens or reaches a named review queue.
- The assigned owner is unavailable and the fallback receives the work.
- An after-hours message follows the documented business-hours route.
- A duplicate synchronization event does not create a second destination record, and each service metric has a written grain and definition.
Approve launch only when the authoritative record, exception owner, after-hours behavior, reopened-message handling, access boundaries, and metric definitions are documented and tested.
Frequently asked questions
How many people can use a Microsoft shared mailbox?
Microsoft’s current guidance states a maximum of 25 users accessing a shared mailbox simultaneously. That is a concurrent-access limit, not a general mailbox-membership figure. Check current tenant guidance for your configuration.
Does Google’s 1,000-delegate limit apply to personal Gmail?
No. Google documents up to 1,000 delegates for work or school accounts and up to 10 for personal Gmail. It recommends limiting concurrent users to about 40 to avoid performance issues. See the current Google Workspace delegation guidance and Gmail delegation guidance.
Does every shared inbox create ticket numbers or SLA timers?
No. A shared mailbox or conversation view may not create tickets or SLA clocks. Confirm ticket creation, lifecycle fields, and SLA behavior for the specific product, inbox type, and subscription.
Can collision detection prevent every duplicate reply?
No. Indicators and shared drafts help teammates coordinate, but teams still need explicit ownership and a handoff procedure. For external record creation, use stable identifiers, database-enforced uniqueness, and a transactional upsert where supported rather than relying on a prior lookup.
For help assessing how inboxes, seats, routing, and service processes fit together, see ConsultEvo’s HubSpot systems service.