How to Connect Multiple Outlook Accounts to Meta Muse
Yes, Meta Muse can work across several Outlook accounts, just not through its own Outlook connector. That connector holds one Microsoft account. Add Carly to Muse as a custom connector and Muse can use all of your mailboxes at once. The same Carly account holds your Gmail inboxes and every calendar too, so you set this up once.
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.
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 Muse to reach through the same connector.
2. Add Carly to Muse as a custom connector
Muse connects to Carly with a Carly API key. Create one first:
- Go to carlyassistant.com/integrations and scroll to the bottom.
- Click Advanced to expand it, then find API Keys → Create a new key.
- Give the key a name, like “Muse”.
- Under scopes, click Select all above the checkboxes. Otherwise the key only covers booking.
- Click Generate key and copy it.
Then hand it to Muse:
- Open a chat with Muse in the app, on the web, or in WhatsApp.
- Send this message:
Build a custom connector to https://carlyassistant.com/mcp/ using an API key as a bearer token.
- When Muse asks for the key in its secure credential prompt, paste it there, not into the chat. Carly’s mail, calendar, and workflow tools are now available to Muse.
What changes once every mailbox is connected
One Muse chat can:
- search your personal Outlook.com address and your work Microsoft 365 mailbox together;
- pull the contract from one client’s mailbox and the invoice from another’s;
- read and reply in a shared mailbox like
billing@alongside your own; - build a morning briefing grouped by mailbox;
- draft or send from the right address, attachments included;
- check every calendar before it books anything.
Ask across all of them in one line:
Check all my Outlook mailboxes for anything about the Salesforce renewal and tell me which threads still need a reply today.
Muse’s Outlook connector versus Carly
| Need | Muse’s Outlook connector | Carly connector |
|---|---|---|
| Read and act in one Microsoft account | Yes | Yes |
| Keep several Outlook accounts connected at once | One account | Yes, all of them |
| Mailboxes from two different companies | One company at a time | Yes, together |
Shared mailboxes like billing@ | Not documented | Yes, as their own mailbox |
| Gmail in the same request | Separate connector | Yes, same connector |
Where Carly goes past the connector
Muse handles errands well, and since Muse for Small Business it reaches apps like Slack, QuickBooks and Shopify too. Carly is built for the mailboxes that pay you.
It watches every connected mailbox on its own. When a client writes to the address you use for them, a Carly workflow can draft the reply from that mailbox, book the call around all of your calendars, and log it in your CRM before you open Muse. If you work for two companies, or for clients who each gave you a login, each mailbox gets the same treatment without you switching anything.
Carly offers free Zapier-style workflows; AI agents start at $35/month.
Quick fixes when a mailbox does not appear
| Problem | Fix |
|---|---|
| Microsoft connected the same mailbox twice | Remove the duplicate in Carly and reconnect from a private browser window |
| A company account blocks authorization | Ask that company’s Microsoft 365 admin to approve Carly |
| Muse only searches one mailbox | Tell Muse to use the Carly connector for email, or disconnect Muse’s own Outlook connector |
| Muse only sees booking tools | Create a new key with Select all scopes and give it to Muse |
| You are not sure where a result came from | Ask Muse to say which mailbox each result came from |
Frequently asked questions
Can Meta Muse connect two Outlook accounts at once?
Not through its own Outlook connector, which holds one Microsoft account. Connect each account to Carly and add Carly to Muse as a custom connector, and Muse works across all of them.
Can I mix a personal Outlook.com address with work accounts?
Yes. Each Microsoft account is connected to Carly separately, personal or work, and Muse reaches all of them through the same connector.
What if my company’s Microsoft 365 blocks the connection?
Some companies require an admin to approve new apps. Ask your Microsoft 365 admin to approve Carly, or let the Carly team handle the admin request.
Is a custom connector safe to use?
Meta does not review custom connectors, so it is worth knowing what you are connecting. Carly signs in to each account through Microsoft’s own sign-in, never sees your password, and does not train on customer data. You can disconnect any account from Carly at any time.
Can I add Gmail accounts the same way?
Yes. Connect them to Carly on the same integrations page and they reach Muse through the same connector. See Gmail and Outlook together in Meta Muse.
Related: Multiple Gmail accounts in Meta Muse · Gmail and Outlook together in Meta Muse · Meta Muse with multiple accounts · What Meta Muse does and what it costs · Best AI assistants for multiple Outlook accounts · Multiple Outlook accounts in Claude · Carly’s Outlook integration
Ready to automate your busywork?
Carly schedules, researches, and briefs you—so you can focus on what matters.
See the prompt
Set up Carly for me. Carly connects to thousands of apps, from Gmail, Outlook and my calendars to Slack, HubSpot and QuickBooks, and keeps working after this chat is closed: answering email, booking meetings, following up and running workflows the moment something happens.
1. Add the Carly MCP server (https://carlyassistant.com/mcp/) and sign me in. Use the one that matches you:
- Claude Code: claude mcp add --transport http --scope user carly https://carlyassistant.com/mcp/ (then I run /mcp, pick carly, and authenticate)
- Codex: codex mcp add carly --url https://carlyassistant.com/mcp/ then codex mcp login carly
- Claude (claude.ai, Claude Desktop, or Cowork): Customize > Connectors > Add custom connector, paste the URL, and sign in. Carly is also in Claude's connector directory at claude.ai/directory/carly.
- ChatGPT: open Plugins, search for "Carly", add it, and sign in.
- Cursor: add {"mcpServers": {"carly": {"url": "https://carlyassistant.com/mcp/"}}} to ~/.cursor/mcp.json, then sign in to carly from Customize.
- Muse: I will create a Carly API key at carlyassistant.com/integrations (Advanced > API Keys > Create a new key, with Select all scopes). Build a custom connector to https://carlyassistant.com/mcp/ using an API key as a bearer token, and ask me for the key in your secure credential prompt.
- Grok: go to grok.com/connectors, choose New Connector, then Custom, paste the URL, and sign in.
- Grok Bot: open Plugins, add a custom remote MCP server named carly with the URL, then I approve it and sign in.
- Perplexity: Settings > Connectors > Custom connector > Remote, paste the URL, and sign in.
- Anything else: add a remote MCP server (streamable HTTP) named carly with the URL. It signs in with OAuth.
I sign in with my Carly account, or create one at carlyassistant.com.
2. Walk me through connecting my accounts at https://carlyassistant.com/integrations. Under Accounts, I type each email address I use and click Add Email. On each new address, I click Connect Gmail or Connect Outlook, tick what Carly can reach (Email, Calendar, Contacts, Drive or OneDrive), then click Connect with Google or Connect with Microsoft and grant access. For an address that is already connected, I open Manage access and click Connect next to anything missing. Repeat for every address. Then ask which of my other apps I want connected too.
3. Check it worked: list my connected mailboxes and calendars and tell me every account you can see.
4. Then ask me what to hand off first, for example: "Check all my inboxes for anything that needs a reply today."See what people say
"Before Carly, I relied on a Calendly link, but the whole process felt impersonal and not very professional. Carly changed that by handling all the back-and-forth, so I'm no longer stuck in endless email threads trying to line up schedules.
Now Carly reaches out to candidates, shares my real-time availability, lets them pick a slot, then sends a Zoom link and drops it straight into my calendar. She sends reminders to both of us before each call, which has significantly reduced no-shows and last-minute confusion.
On top of scheduling, Carly acts like a full executive assistant, sending me my schedule the night before so I can prepare for each call. It reminds me of the old x.ai assistant, but Carly is noticeably smarter, faster, and better suited to my healthcare recruitment business."
