Install

Hello there, @Gunkela.

There are several reasons Outlook 365 is missing in QuickBooks. Let me provide you with steps to get you up and running again.

• Incompatible Microsoft Outlook version with your QuickBooks version.
  1. Verify the version of Outlook
  2. Verify the compatible version of Outlook based on the version of QuickBooks Desktop
     • System requirements for QuickBooks 2018 and Enterprise Solutions 18.0
     • System requirements for QuickBooks 2017 and Enterprise Solutions 17.0
     • System requirements for QuickBooks 2016 and Enterprise Solutions 16.0
• Improper Microsoft Outlook Profile
  1. Close QuickBooks.
  2. Open Outlook.
  3. Choose File.
  4. Select Options.
  5. Go to the General tab.
  6. Scroll down to the Start up Options section.
  7. Check the box next to Make Outlook the default program for Email, Contacts, and Calendar.
• Microsoft Outlook may not be configured properly within Internet Explorer
  1. In the Internet Explorer, choose Tools.
  2. Choose Internet Options, then select Program Tab.
  3. At the bottom of the window, click Set Programs.
  4. Click Set your default programs.
  5. Choose Outlook 365.
  6. Select Set this program as default and click OK.
  7. Click Set program access and computer defaults.
  8. Select Microsoft Windows.
  9. Click the drop-down arrow and select Use my current Microsoft e-mail program.
  10. Click OK.
       
• Windows Mail profile settings maybe improper. 
• The Windows WIN.INI file may not be properly configured.
• Microsoft Outlook maybe corrupted, or have a corrupted component.
• QuickBooks and Microsoft Outlook may not have installed necessary third party components when initially installed.

You can also check these articles for other troubleshooting options:

• Outlook is missing in QuickBooks Desktop Send Forms preferences.

• Error: QuickBooks is unable to send your email to Outlook

If the error persists, I'd recommend reaching out to our Technical Support team. A specialist will be able to further help you via a secured remote access session.

Here’s how to contact:

1. Go to the Help menu.
2. Click Contact Us.
3. Under How can we help? type in any keyword about your concern.
4. Hit Continue.
5. Click Get a call back to contact us.

I'll be here if you have other questions about sending forms in QuickBooks, feel free to leave a post.