---
title: "Microsoft 365 User Guide"
slug: "microsoft-365-user-guide"
updated: 2026-04-28T11:32:53Z
published: 2026-04-28T11:32:53Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.nasuni.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Microsoft 365 User Guide

## **Introduction**

Web Access lets you preview many Microsoft-format documents using a rich preview experience powered by Microsoft 365. This provides a high-fidelity preview directly in the browser—so you can review content without downloading the file.

## **Previewing**

### **Supported File Formats for Previewing**

Web Access supports Microsoft 365 previews for the following file types:

#### **Microsoft PowerPoint**

- pptx, pptm, ppsm, ppsx, potx, potm, ppt, pps, pot

#### **Microsoft Excel**

- xlsx, xlsm, xlsb, xls

#### **Microsoft Word**

- docx, dotx, docm, dotm, dot, doc

#### **Microsoft Visio**

- vsdx, vsdm, vsd, vdw

#### **OpenDocument**

- Presentation: odp
- Spreadsheet: ods
- Text: odt

#### **Other formats**

- csv (Comma-Separated Values)
- rtf (Rich Text Format)

### **How To Preview**

There are two ways to preview files in Web Access:

#### **Sidebar preview**

Use the sidebar preview to quickly review a document alongside your file list.

![](https://cdn.document360.io/2adf6ce2-c120-4520-b135-0fc4463ddde3/Images/Documentation/image-1E6PE18J.png)

You can open the sidebar preview by:

- Selecting a file in the file list and clicking the **Preview** icon in the top toolbar, or
- Right-clicking a file and selecting **View details**

#### **Full-screen preview**

![](https://cdn.document360.io/2adf6ce2-c120-4520-b135-0fc4463ddde3/Images/Documentation/image-R2PETP2G.png)

To view a larger version of the document:

- Open the **sidebar preview**, then
- Select the **Expand** icon to switch to **full-screen** preview

## **Editing or Co-Authoring**

Web Access lets you edit supported documents directly in your browser using Microsoft 365 for the web. Editing also supports real-time co-authoring, so multiple users can work in the same document at the same time.

### **Supported File Formats for Editing**

Web Access supports Microsoft 365 editing and co-authoring for the following file types:

#### **Microsoft PowerPoint**

- pptx, ppsx

#### **Microsoft Excel**

- xlsx, xlsm, xlsb

#### **Microsoft Word**

- docx, docm

### **Editing a Document**

Editing is available only to users who are logged in to Web Access.

To start editing:

1. Open the file in either Sidebar Preview or Full-screen Preview.
2. Select **Edit in Word for the web**, **Edit in Excel for the web**, or **Edit in PowerPoint for the web** (button label varies by file type).
3. The document opens in a new browser tab for editing.

### **Editing with Other Users (Co-authoring)**

When you edit a document through Web Access, other users with access to the file from the same Web Access installation can open and edit it at the same time.

While co-authoring:

- Presence indicators (icons or avatars) appear for other users who are currently editing.
- Microsoft 365 synchronizes changes automatically in real time.

### **What to expect while editing**

#### **Autosave and saving changes**

- Changes are saved automatically by Microsoft 365 while you edit (no manual “Save” required in most cases).
- If a user closes the tab, the latest edits are typically already saved.
- If a connection is temporarily lost, Microsoft 365 typically continues attempting to synchronize. After the connection returns, Microsoft 365 resumes saving.

#### **Seeing other people (presence)**

- When other users open the same document for editing, presence indicators (icons or avatars) appear.
- In many cases, the editing location of other users appears (for example, cursor or selection highlights), depending on the document type and Microsoft 365 behavior.

#### **Co-authoring behavior**

- Co-authoring is real-time: edits from others appear as they are made.
- Users do not need to “merge” changes because Microsoft 365 coordinates updates automatically.

##### **Conflicting changes**

If another user changes the document outside of Microsoft 365 while you are editing (for example, by updating the file through a different tool or workflow), Microsoft 365 may detect a conflict.

What happens next:

- User edits are not lost. User changes remain preserved.
- Web Access retains the edited version and renames the file to indicate a conflict.
- The user can continue editing the open document.
- After editing finishes, compare the two files and reconcile the differences manually (for example, copy changes from one version to the other).

## **Performance tips**

- Large files (especially complex spreadsheets or presentations) might take longer to open in the editor.
- If editing appears slow, close other resource-intensive browser tabs and reload the editor tab.