Microsoft Outlook is an important part of the Microsoft Office, and it lets users manage the personal details. The Gmail IMAP error 78754 on Outlook occurs while trying to access the Gmail account. If you want to fix this issue, then you need to follow the steps mentioned in this article.

Here’s how to fix Gmail IMAP error 78754 on Outlook

Enable IMAP and permit less secure apps on Gmail
Launch the Gmail log-in webpage by using your default browser.
Sign in to the Gmail account by entering the important information.
Press on the Gear symbol located on the upper right-hand side of the screen.
Choose the Settings tab.
You will find this option on the pull-down menu.
Change the Forwarding and POP/IMAP option.
After that, choose the Enable IMAP option.
You will find this option near the IMAP access.
Press on the Save Changes option.
Creating an App-specific password
Go to the Gmail Log on the webpage on the default web browser.
Sign in to the Gmail account by typing the account information.
After signing in to the Gmail account, go to the Google Security webpage from the default internet browser.
Go to the Signing into Google option.
Press on the App password option.
Verify the log in option once again to move to the next step.
Press on the Select app option.
After that, press on the Other option, which is your custom name.
Enter Outlook in the provided box.
After that, click on the Generate option.
It will create an application password for the device.
Start copying the created 16-digit password.
You need to enter the generated password to log in to the Microsoft Outlook account.
It might be possible that this error will fix this issue.
In case not, then move to the next method.
Go through the Microsoft Outlook Configuration
Press on the Start option.
Otherwise, click on the Windows key provided on the system keyboard.
Find Outlook.
Click on the Enter button.
Press on the Advanced options button.
Go through the Let me set up my account manually option.
Press on the Connect option.
Choose the IMAP or POP or Google on any other Windows version.
Make sure that the IMAP or POP access is enabled.
Start using the server details to sign in to the Microsoft Outlook account properly.
After that, type the sign-in information.
Enter the right details.
Press on the Connect option.
Update the Microsoft Outlook
Press on the Start option.
Click on the Windows key.
Find the Outlook file.
Press on the Enter option.
Go to the file.
Press on the Office account.
Press on the Update Options button.
Choose the Update Now option by going to the pull-down list.
It will automatically search for a new version.

Source:- http://setupmenow.com/how-to-fix-gmail-imap-error-78754-on-outlook/

Mia Davis is a self-professed security expert; she has been making the people aware of the security threats. Her passion is to write about Cyber security, cryptography, malware, social engineering, internet and new media. She writes for Norton security products at norton.com/setup.