Outlook FAQ
Common questions about Outlook and Office 365 integration with Missive.
Do you support Microsoft Exchange?
Yes, via IMAP. See Microsoft Exchange for setup instructions.
Most Exchange servers have IMAP enabled. If yours doesn't, contact your IT administrator.
Do you have tips for users transitioning from Outlook to Missive?
Yes, we made a video:
Where are my folders?
Can I move an email to a folder?
Where is my Archive folder?
Do you support Office 365 shared mailbox account?
Yes, when adding the email account:
Open your Accounts settings, click Add account, select Office 365.
Enter the shared mailbox email address.
Then, in the Microsoft connection popup, select an Office 365 account that has access to that shared mailbox.
I can't add a specific Office 365/Outlook account?
If you try to connect a different Office 365 account and you are always forced to select the same one, it’s a bug on Microsoft’s side, completely out of our control. The workaround is to log in to Missive and connect your Office 365 / Outlook account(s) from a private browser window.
Here’s how to do so (on a desktop computer, mobile is not supported):
Open a private / incognito browser window (see instructions for Google Chrome, Firefox and Safari).
Type mail.missiveapp.com in the address bar.
Log in to Missive.
Click your avatar at the top of the sidebar, click Accounts, then Add account.
Connect your account.
For each account, you may need to start over at step 1. Otherwise, the Microsoft popup may keep forcing you to select the account you previously selected.
Where can I find my folders?
Missive fully supports folders and sub-folders (they are called Labels in the Missive interface, but they really are the same thing). You just need to open the + Pin to sidebar menu in the left sidebar to list all your available labels, grouped per email account. When you click on a label from there, it will get pinned to the sidebar.
You can also open/pin all your folders hierarchy by clicking on the Open all option.
Video: Tips for the Outlook users using Missive for the first time.
Do Outlook categories sync to Missive?
No. Outlook categories don't sync to Missive. Only folders sync as labels.
In Outlook, folders and categories work differently. Folders store emails in specific locations and sync to Missive. Categories are color-coded tags that don't affect where emails are stored and don't sync.
If you use Outlook rules to organize emails with categories, consider switching to folder-based rules instead so your organization syncs to Missive.
How can I access my Junk Email folder?
To access default mailboxes like Junk Email:
Click + Pin to sidebar in the left sidebar
Select Main Section
Click Spam to pin it to your sidebar
Outlook calls it "Junk Email", but Missive calls this mailbox Spam. They're the same thing.
You can also access other default mailboxes (Drafts, Sent, Trash, All) using the same method.
What happens if I change my email address in Exchange/Office 365?
If you rename or change an email address on the Microsoft/Exchange side, Missive won't automatically detect the change. You need to refresh the account connection.
To refresh the account:
Go to Settings > Accounts
Click Add account > Office 365
Enter the new email address
Click through the setup wizard (the options you select don't matter)
In the Microsoft authentication window, select the account
This refreshes the connection without duplicating the account. All existing conversations, assignments, comments, and labels remain intact.
Composing
Can I mark outgoing emails as "High Importance"?
No. Missive does not support marking outgoing emails with the "High Importance" flag like Outlook does (RFC 4021).
Gmail also doesn't support this feature. When importance flags are easily accessible, users tend to over-apply them to non-critical messages to ensure faster responses. This leads to "priority inflation" where recipients ignore the flags entirely, making them useless for actual emergencies.
If you need to filter incoming emails marked as important by other Outlook users, see detecting high importance emails with rules.
Deliverability
I'm getting "Access denied, traffic not accepted from this IP" when sending emails - what does this mean?
This error message is misleading. It sounds like the recipient's server is rejecting your email, but it's actually your Office 365 installation refusing to send it.
Two possible causes:
Microsoft trial account
Trial accounts have limitations that prevent them from sending emails through third-party apps like Missive.
Solution: Purchase a paid Office 365 subscription.
Office 365 blocking Missive's IP addresses
New Office 365 installations often block third-party apps by default until the IPs are explicitly allowed.
Solution: Open a support ticket with Microsoft asking them to allow your account/tenant to send emails through Missive's IP addresses.
Get the complete list of Missive's IP addresses in the Email deliverability guide. When contacting Microsoft Support, include those IP addresses and explain that they are used by Missive (your email client) to connect to Microsoft servers.
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