How to Connect Multiple Outlook Accounts to ChatGPT Work
Yes—you can connect multiple Outlook or Microsoft 365 work accounts to ChatGPT Work with Carly. Authorize every independent Microsoft identity in Carly, add Carly to ChatGPT once, and Work can search or act across the right mailbox without constant account switching. The same Carly account holds your Gmail inboxes and every calendar on both sides, so you set this up once for all of it.
1. Add your Outlook accounts to Carly
- Sign in at carlyassistant.com.
- Open carlyassistant.com/integrations.
- Find Outlook, click Connect, and authorize the account.
- Click Connect again for the next one, and keep going for as many accounts as you want.
If Microsoft displays Need admin approval, ask the Entra administrator for that tenant to approve the connection, then finish authorization.
Each mailbox keeps its own credentials and permissions. Carly simply makes those named connections available through one ChatGPT plugin.
Carly connects to thousands of apps, so while you are on that page you can add your calendars, files, CRM, and anything else you want ChatGPT Work to reach through the same connector.
2. Add Carly to ChatGPT Work
- Open Plugins in the ChatGPT sidebar.
- Click +.
- Paste
https://carlyassistant.com/mcp/. - Continue to authorization.
- Sign in to the Carly workspace containing the Outlook accounts.
- Make Carly available to the Work task.
OpenAI’s Apps in ChatGPT documentation explains that workspace admins can control which plugins and underlying apps are available. If + is disabled, ask the ChatGPT workspace administrator to enable the connection.
What you can do with several Outlook accounts connected
One ChatGPT Work task can:
ChatGPT’s Outlook app authorizes the Microsoft identity that signs in, and a second Microsoft login replaces the first rather than joining it. Two companies means two logins, and five means five; no amount of reconnecting puts them in one Work task. Carly holds each identity as its own authorized connection and hands ChatGPT Work all of them behind one plugin.
Shared mailboxes count as mailboxes here
A tenant’s team inboxes are usually the reason someone wants a second account in the first place. billing@, support@ and careers@ are each a mailbox a group replies from, not a person’s login.
ChatGPT’s Outlook app can read a shared or delegated mailbox the signed-in identity already has rights to, with one documented gap: attachments in it cannot be retrieved.
Carly connects a shared mailbox as its own mailbox. It sits in the same list as your personal accounts, carries its own shared flag, and you name it in a prompt exactly like any other address:
In the
billing@peakline.comshared mailbox, list every unpaid invoice thread from this month and state the source mailbox on each row.
More in Can ChatGPT access a shared mailbox? and AI for shared mailboxes.
Native Outlook versus Carly in ChatGPT Work
| Need | Native Outlook app | Carly plugin |
|---|---|---|
| Search one Microsoft 365 identity | Yes | Yes |
| Search its delegated mailboxes | Yes | Yes, according to account permissions |
| Use two independent Microsoft identities | Not in one native connection | Yes |
| Compare Outlook accounts across tenants | No | Yes |
| Select the sending account in one Work task | Limited to the native authenticated identity | Yes |
| Run the same multi-account workflows outside Work | No | Yes |
Carly gives ChatGPT Work one account-aware toolset for every connected Outlook identity. Carly offers free Zapier-style workflows; AI agents start at $35/month.
The plugin is the smallest thing Carly does
Five tenants is exactly the mess Carly exists for. It is a full AI executive assistant across every company you just connected: each morning’s triage done per tenant, drafts waiting in the right mailbox, follow-ups chased, meetings booked around every calendar, while no Work task is open. Pre-built recipes like a cross-tenant daily brief take minutes to turn on.
Quick fixes when an Outlook account does not appear
| Problem | Fix |
|---|---|
| Microsoft opens the first account again | Choose Use another account and reconnect |
| Microsoft shows Need admin approval | Ask that tenant’s Entra administrator to approve Carly |
| A shared mailbox is missing | Confirm the primary user can open it in Outlook |
| ChatGPT Plugins + is disabled | Ask the ChatGPT workspace admin to enable the plugin/app |
| Work uses the wrong tenant | Put the full address in the prompt and require source attribution |
Frequently asked questions
Can ChatGPT Work natively connect two Outlook accounts?
The native Outlook app works with one authenticated Microsoft identity and the shared or delegated mailboxes it can access. Carly makes multiple independently authenticated Outlook accounts available inside one Work task.
Can the cross-tenant work run while I am away?
A Work task only acts while you are in it. Hand the recurring cross-tenant work to Carly and it runs unattended in the same connected accounts.
Is a shared Outlook mailbox a second account?
For the native Outlook app, no. A shared or delegated mailbox rides on access a primary identity already has, and ChatGPT can read shared and delegated mailboxes alongside that one login, though attachments in them do not come back. Carly connects a shared mailbox as its own mailbox, listed beside your personal accounts with its own shared flag. A mailbox with its own login or tenant is a real second account, and holding several of those is what Carly is for.
Does Carly merge the Outlook inboxes?
No. Every mailbox remains in its original Microsoft 365 account. Work can search across them, while Carly routes each draft, send, folder move, category, or calendar action to the address you name.
Related: What is ChatGPT Work · ChatGPT Work connectors · ChatGPT + Outlook · Manage multiple email accounts with AI · Carly’s Outlook integration
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