Install and Set Up MeinGPT for Outlook

This guide explains step by step how to install and set up the MeinGPT Outlook add-in. The add-in brings the MeinGPT platform directly into Outlook so you can summarize email threads, ask follow-up questions, and draft replies.

Add-in or Microsoft 365 connector? What's the difference?

The two can be used independently — the add-in doesn't replace the connector, and vice versa.

Requirements

• Supported versions: Outlook on the web, Outlook for Windows (classic and new), and Outlook for Mac
• In classic Outlook for Windows, the add-in side panel is rendered via the Microsoft Edge WebView2 Runtime, and its interface is loaded from assets.meingpt.com (Outlook itself also loads appsforoffice.microsoft.com for its JavaScript API). In Citrix/VDI environments (virtualized Windows desktops), WebView2 is often missing, or network access to these domains is restricted by a proxy/firewall policy – either can cause a black or blank add-in window. Check with your IT team whether WebView2 is installed on the virtual image (Microsoft download↗) and whether the domains above are allowed.
• Your organization may allow or restrict add-ins. If an option is missing, check with your IT team or a Microsoft 365 admin.
• A MeinGPT API key is required to sign in to the add-in. The API is an Enterprise feature and must be enabled for your organization – if it isn't, the MeinGPT API menu entry under Account won't be there; in that case contact enterprise@meingpt.com or a workspace admin.

Installation for end users

From the store (AppSource / "Get Add-ins")

Note: Depending on the Microsoft Store or Outlook language, the add-in may appear as MeinGPT or myGPT. If one name does not show up in search, try the other variant as well.

Outlook on the web and new Outlook for Windows

1. Open Outlook.
2. In the top bar, go to More Apps and then Get Add-ins.
3. Search for MeinGPT.
4. Open the add-in and select Add.
5. Optional: In the message view, open More Apps and pin MeinGPT to the toolbar for faster access.

Outlook for Windows (classic)

1. Open File -> Manage Add-ins. This opens add-in management in the browser.
2. Open the Store / AppSource.
3. Search for MeinGPT and select Add.

Outlook for Mac

1. Open Tools -> Get Add-ins.
2. Search for MeinGPT.
3. Select Add.

Note: After installation, MeinGPT appears in the reading view, that is, once you select a received email or open it in its own window – under Apps / More Apps or as its own ribbon icon. Use Pin to keep it visible. The add-in is not available while you write a new email.

Organization-wide rollout for admins

Microsoft 365 admins can deploy the add-in centrally:

1. Open the Microsoft 365 Admin Center.
2. Go to Settings -> Integrated apps -> Add-ins.
3. Select Deploy Add-in.
4. Choose AppSource as the source and search for MeinGPT.
5. Assign the add-in to all users, specific groups, or selected users.
6. Review the configuration and complete the deployment.

After that, the add-in appears automatically in the Outlook clients of the assigned users.

First sign-in and usage

1. Create an API key in MeinGPT: from the user menu in the lower-left corner, open Profile Settings and select MeinGPT API under Account.
2. Select or open a received email. The add-in only works in the reading view of a message, not while composing.
3. Select Open chat. The very first time you open it, the add-in shows its own API key field – paste the key you created in step 1 there and confirm with Save & Continue.

Updating the API key later

If the key is reset or recreated in MeinGPT, the add-in does not pick that up automatically – the old key stays stored locally. In the add-in, open the settings icon at the top and select Logout to clear the stored key. The add-in then shows the entry screen from step 3 again, where you paste the new key.

Troubleshooting

The add-in does not appear or cannot be opened

• The add-in only appears for received emails, not in a new message window. Select or open an email in your inbox – MeinGPT is then available under Apps / More Apps or in the ribbon.
• Restart Outlook and make sure all Outlook windows are fully closed first.
• Check whether the add-in is enabled under Manage Add-ins.
• On company-managed devices, confirm with IT whether policies or restrictions are blocking the add-in.

Add-in window stays black or turns blank/white (common in Citrix/VDI environments)

• This mainly happens in virtualized Windows desktops (Citrix, VMware Horizon, Azure Virtual Desktop) with classic Outlook for Windows. Two possible causes: the Microsoft Edge WebView2 Runtime is missing or outdated, or a network/proxy policy is blocking assets.meingpt.com or appsforoffice.microsoft.com.
• To narrow it down: from within the same Citrix/VDI session, open a normal browser tab (not via Outlook) and go directly to https://assets.meingpt.com/outlook/taskpane.html. This is a clue, not a diagnosis: a normal browser tab doesn't run through the embedded WebView2 process and may not take the same network path, so neither result confirms the cause on its own.
• Have IT check both possible causes directly: whether the Microsoft Edge WebView2 Runtime is installed and up to date on the virtual image (Microsoft download↗), and whether the proxy/firewall allowlist for the domains above also applies to the embedded add-in process.
• If the add-in works in Outlook on the web (OWA), that's not a reliable indicator of the cause – OWA may run over a different network path than the Win32 client's embedded add-in area.

The add-in keeps getting disabled

• Open File -> Options -> Add-ins.
• Under Manage, choose COM Add-ins and then Go....
• Enable the checkbox for the add-in and confirm with OK.
• If Outlook offers it, select Always enable.

Error message when opening chat or sending a message (e.g. "... failed with status ...")

• First check whether the currently valid API key is actually stored in the add-in: open the settings icon in the add-in -> Logout, then paste the key again. A key that was reset or recreated in MeinGPT is not picked up by the add-in automatically.
• Check under Account -> MeinGPT API in MeinGPT that the key still exists and wasn't deleted in the meantime.
• Note the exact error message and status code and forward them to support. When the model list loads, 401 points to a wrong or missing key. When you send a message, an invalid key returns status 400 instead, and an exhausted balance returns 402 (see Credits system). A 403 when sending often means your usage tier has no "API usage" budget or it is used up - the add-in counts as API usage regardless of the selected model. A workspace admin can assign you a usage tier with an API budget under Settings → Members (see Usage limits). Less often, the selected model isn't enabled for the organization. Please forward any other codes to support.

Privacy and security

• Access: The add-in only accesses the current message when you actively open it or trigger an action.
• Transmission: Content is only sent to MeinGPT when you start a MeinGPT action, such as a summary or reply draft.
• Transmission in detail: The subject and plain-text body of the selected message (plain text, at most the first 16,000 characters) and your chat messages go to the MeinGPT API and the model you choose. Sender, recipients and attachments are not read. The model's hosting region applies (see Models).
• History: The conversation history, including the subject and text of the message, is kept locally in the Outlook client's browser storage.