Ignore the microsoft mailbox sync operation has failed again email scam

Also Known As: possible malware infections
Damage level: Medium

What is microsoft mailbox sync operation has failed again email scam?

Scammers use email to trick recipients into providing them their personal information. Most scammers try to steal passwords, social security numbers, credit card details, or other information. This particular email is used to trick recipients into entering login credentials on a fake Yahoo website.

microsoft mailbox sync operation has failed again email scam email spam campaign

Overview of the microsoft mailbox sync operation has failed again email scam

Scammers behind this email attempt to trick recipients into believing that Microsoft mailbox synchronization has failed and clicking on of the provided hyperlinks ("Synchronize Your Mailbox", "Open", or "Read Your Messages" to fix the problem. The three links in this email open a fake Yahoo login page.

Scammers use the aforementioned login page to steal Yahoo Mail login credentials (email addresses and passwords). Luckily, users who have 2FA (Two-Factor Authentication) enabled in their Yahoo Mail accounts cannot have their accounts stolen without a verification code that Yahoo sends via SMS while trying to log in.

Users who can access their Yahoo account with their email address and password should add an extra security layer such as 2FA on their account. Otherwise, scammers could easily steal their accounts using fake login websites. Also, it is strongly recommended not to use the same login credentials for multiple accounts.

Threat Summary:
Name Microsoft mailbox sync operation has failed again email scam
Threat Type Phishing, Scam, Social Engineering, Fraud
Fake Claim Microsoft mailbox synchronization has failed
Disguise Letter from email service provider
Symptoms Unauthorized online purchases, changed online account passwords, identity theft, illegal access of the computer.
Distribution methods Deceptive emails, rogue online pop-up ads, search engine poisoning techniques, misspelled domains.
Damage Loss of sensitive private information, monetary loss, identity theft.
Malware Removal (Windows)

To eliminate possible malware infections, scan your computer with legitimate antivirus software. Our security researchers recommend using Combo Cleaner.
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Email scams look like letters from legitimate entities (in this case, an email service provider). The main purpose of these emails is to trick recipients into providing sensitive information. More examples of email scams are "New Documents Assigned", "Have You Heard About Pegasus?", and "New Fax Received". Email can be used to deliver malware as well.

How do spam campaigns infect computers?

Users install malware through emails by opening malicious attachments or files downloaded via website links. Most cybercriminals use Microsoft Office documents, PDF documents, ZIP, RAR or other archive files, JavaScript files, executable files like EXE, or other files to deliver malware via email.

Malicious documents opened with Microsoft Office 2010 or newer do not install malicious software unless users enable macros commands (enable editing or content). It does not apply to documents opened with older MS Office versions. Those versions do not have the "Protected View" mode, which prevents automatic malware installation.

How to avoid installation of malware?

Files and attachments in irrelevant emails should not be opened, especially when received from unknown addresses. Programs (and files) should be downloaded from official websites and via direct links and not from or through unofficial pages, third-party downloaders, Peer-to-Peer networks, and so on.

Third-party (fake) installers should not be used too. Already installed software should be updated or activated with functions or tools provided by the official developers. Other tools can be malicious. Moreover, it is not legal to use cracking tools to activate legitimate programs.

The operating system should be scanned for malware or other threats regularly. It should be scanned with reputable anti-spyware or antivirus software. If you've already opened malicious attachments, we recommend running a scan with Combo Cleaner Antivirus for Windows to automatically eliminate infiltrated malware.

Appearance of the microsoft mailbox sync operation has failed again email scam (GIF):

microsoft mailbox sync operation has failed again email scam appearance

Text in this email scam:

Subject: Warning ******** You Have Pending Microsoft Office UNSYNC Messages

Dear ********,

Below is your email account status as confirmed by ********

Email Address: ********

Email Status: Unsuccessful !!!

Last successful sync: 2/09/2021 08:35:53 AM UTC.

It looks like your microsoft mailbox sync operation has failed again:

For self maintenace, You are directed as follows:

If you're using the new Mail experience or Classic version in Microsoft Office365 or Outlook Application, Kindly click on the available ******** ePortal options (blue below) and LOGIN to access eportal. Note that you will not need this link again.

Go To :

Synchronize Your Mailbox
Read Your Messages

All pending messages would be automatically deleted after

Note:  To stop receiving these notifications, please select sync operation to successfully sync the pending messages on your server .

This message was sent from an unmonitored e-mail address. Please do not reply to this message.

Microsoft Office
One Microsoft Way
Redmond, WA
98052-6399 USA

Fake Yahoo login page used to steal login credentials:

microsoft mailbox sync operation has failed again email scam fake yahoo login page

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Combo Cleaner is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
▼ DOWNLOAD Combo Cleaner By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. To use full-featured product, you have to purchase a license for Combo Cleaner. 7 days free trial available. Combo Cleaner is owned and operated by Rcs Lt, the parent company of PCRisk.com read more.

Quick menu:

How to remove malware manually?

Manual malware removal is a complicated task - usually it is best to allow antivirus or anti-malware programs to do this automatically. To remove this malware we recommend using Combo Cleaner Antivirus for Windows.

If you wish to remove malware manually, the first step is to identify the name of the malware that you are trying to remove. Here is an example of a suspicious program running on a user's computer:

malicious process running on user's computer sample

If you checked the list of programs running on your computer, for example, using task manager, and identified a program that looks suspicious, you should continue with these steps:

manual malware removal step 1Download a program called Autoruns. This program shows auto-start applications, Registry, and file system locations:

screenshot of autoruns application

manual malware removal step 2Restart your computer into Safe Mode:

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup.

Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button.

In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":


manual malware removal step 3Extract the downloaded archive and run the Autoruns.exe file.

extract autoruns.zip and run autoruns.exe

manual malware removal step 4In the Autoruns application, click "Options" at the top and uncheck "Hide Empty Locations" and "Hide Windows Entries" options. After this procedure, click the "Refresh" icon.

Click 'Options' at the top and uncheck 'Hide Empty Locations' and 'Hide Windows Entries' options

manual malware removal step 5Check the list provided by the Autoruns application and locate the malware file that you want to eliminate.

You should write down its full path and name. Note that some malware hides process names under legitimate Windows process names. At this stage, it is very important to avoid removing system files. After you locate the suspicious program you wish to remove, right click your mouse over its name and choose "Delete".

locate the malware file you want to remove

After removing the malware through the Autoruns application (this ensures that the malware will not run automatically on the next system startup), you should search for the malware name on your computer. Be sure to enable hidden files and folders before proceeding. If you find the filename of the malware, be sure to remove it.

searching for malware file on your computer

Reboot your computer in normal mode. Following these steps should remove any malware from your computer. Note that manual threat removal requires advanced computer skills. If you do not have these skills, leave malware removal to antivirus and anti-malware programs.

These steps might not work with advanced malware infections. As always it is best to prevent infection than try to remove malware later. To keep your computer safe, install the latest operating system updates and use antivirus software. To be sure your computer is free of malware infections, we recommend scanning it with Combo Cleaner Antivirus for Windows.

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About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

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Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

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