Attachment Issues

How to Fix Cannot Open Word Attachment in Outlook on iPhone

Emma Brown Oct 13, 2026 869 views

Question details

The user is unable to open or view Microsoft Word document attachments directly from the Outlook mobile app.

How to Fix Cannot Open Word Attachment in Outlook on iPhone

Product: Microsoft Outlook, Microsoft Word
Device & OS: iPhone / iOS
Scenario: Attempting to tap and open a Word attachment received in an email via the Outlook mobile app.
Observed behavior: The Word attachment fails to load or open despite having the Microsoft 365 or Word app installed, typically due to a corrupted account session or app state.

Before you start

Ensure your iPhone has a stable internet connection and that you know your email account credentials before attempting to reset your Outlook account.

Solution 1Recommended

Reset Your Account in the Outlook App

Resetting the account clears out corrupted session states that prevent attachments from opening, without deleting your emails.

A corrupted session cache in the Outlook app can interrupt the connection between Outlook and Microsoft Word. Resetting the account forces the app to resync with the server.

Open Outlook Settings

Launch the Outlook app on your iPhone, tap your profile icon in the top left corner, and then tap the gear icon at the bottom left to open the Settings menu.

Select the Affected Account

Under the 'Email Accounts' section, tap on the email account that is experiencing the attachment issue.

Tap Reset Account

Scroll down and tap 'Reset Account'. Be very careful to select 'Reset Account' and not 'Delete Account'.

Restart and Test

Wait for the app to restart and refresh your inbox, then open the email and try opening the Word attachment again.

No Data Loss: Tapping 'Reset Account' will not delete your emails, contacts, or calendar events. It simply refreshes the app's local sync state.

Solution 2

Update Outlook and Word Apps on iOS

Outdated apps can cause compatibility issues with file handling. Updating ensures you have the latest bug fixes.

Free Microsoft Office alternative

Use WPS Office to Open Attachments Seamlessly

If Microsoft Word for iOS continues to fail when opening email attachments, try WPS Office. It is a lightweight, free alternative that is fully compatible with Microsoft Office formats, allowing you to easily view and edit Word documents directly from your mobile inbox without sync errors.

1. Download WPS Office: Get WPS Office for free from the iOS App Store.
2. Open the Attachment: Go to Outlook, tap your Word attachment, and tap the 'Share' icon.
3. Select WPS Office: Choose WPS Office from the share sheet to instantly open and view your document.

Fully compatible with Microsoft Word (.doc, .docx) formatsLightweight app that saves storage space on your iPhoneOpen, view, and edit email attachments effortlesslyFree to use with a familiar, user-friendly mobile interface

microsoft office alternative - wps office

Frequently Asked Questions

Why won't my iPhone open Word documents sent via email?

This is often caused by a corrupted account session in your mail app, an outdated document viewer, or low storage space on your iPhone preventing the file from downloading and caching properly.

Does 'Reset Account' in Outlook delete my emails?

No, tapping 'Reset Account' only clears the app's local cache and restarts the sync process with the mail server. Your emails and contacts remain safe and will reappear once the sync completes.

How do I change the default app to open Word attachments on iPhone?

iOS does not allow a strict default app setting for documents. However, you can tap the 'Share' icon when previewing an attachment and select a different app, like WPS Office, to open and edit the file.

Outlook & Email Problems