Change from a 32-bit version to a 64-bit version or vice versa. Activate Windows. Fix Bluetooth problems in Windows. Learn how to install, reinstall, or activate Microsoft 365 or Office 2019 on a PC or Mac.

Install Microsoft 365 2019 or 2016 on a PC. Remember a one-time purchase version of Microsoft 365 is licensed for one install only. Depending on your browser, select Open file (in Edge or Internet Explorer), Setup (in Chrome), or Save File (in Firefox).

SharePoint is a browser-based app that you connect to through your web browser, like so: Go to office.com, and sign in to your work or school account. In the upper left corner of the window, select the app launcher > All apps > SharePoint.

Unblock picture downloads for a single message. You can unblock downloads of linked pictures and other external content for a single message that comes from a trusted source. Choose the InfoBar at the top of the message, and then click Download Pictures.

Fix your audio drivers. Hardware problems can be caused by outdated or malfunctioning drivers. Make sure your audio driver is up to date and update it if needed. If that doesn't work, try uninstalling the audio driver (it will reinstall automatically).

Hotmail is now Outlook.com. Learn how to sign in to access your Outlook.com, Hotmail, Live, or MSN email account.

Use the Office offline installer to install Office 2016 or Office 2013 if you don't have an active Internet connection or you're having problems with slow speed or unreliable connections.

Outlook gives you several options for saving an email message. A message that you receive, for example, can be saved as a file on your computer or in another folder in Outlook. A message you're composing can be saved as a draft and finished later. Select a tab option below for the version of Outlook you're using.

Try these solutions if you can't sign in to your Outlook.com, Hotmail, Live, or MSN email account, or you're not sure how to sign in or sign out.

Save attachments in new Outlook. To save the attachment, click the dropdown arrow and select Download or Save to OneDrive. Click Download to save one attachment to your computer or cloud storage location. Click Download all to save all attachments from a single message.