Do you ever import or enter data in Excel that contains leading zeros, like 00123, or large numbers like 1234 5678 9087 6543? Examples of these are social security numbers, phone numbers, credit card numbers, product codes, account numbers, or postal codes.

Learn how to change Internet Explorer settings, or reset browser settings when there's a problem.

Training: Watch this video to learn how to switch your Outlook calendar view between day, week, or month views, change the week displayed, and see different shared calendars.

For New Outlook for Windows: To see how much mailbox storage you've used and quickly clear up space: At the top of the page, select Settings > Accounts > Storage.

Select Start , then select Settings > Personalization > Themes.Choose from a default theme or select Get more themes in Microsoft Store if you want to download new themes with desktop backgrounds that feature cute critters, breathtaking landscapes, and other smile-inducing options.

Learn more about what items get imported from Google Chrome and other browsers to Microsoft Edge and how to import Third-Party Passwords to Microsoft Edge.

You weren't able to find your username. If the username lookup wasn't successful, try looking for your Microsoft account username within other products or services that you know are associated with that account.

Get in touch with Microsoft Support for assistance with Microsoft products and services.

Learn how to check what version of Office your using. Find your product name and version number of Office apps.

Windows backup and sync settings sync the settings you choose across all your Windows devices that you've signed in to with your Microsoft account.